Compare conductors and insulators, series and parallel circuits, switches, fuses and circuit symbols. Review suitability for your learners before teaching.
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Worksheet StudioPractice pack · Ages 7-9
Conductors, insulators & circuits
Take your time. Show your thinking.
1. In a standard circuit diagram, what does a long thin vertical line paired with a shorter, thicker vertical line represent: a single electrical cell, or an open switch?
Cell (+) ── Switch ── (−) · Closed Series Loop
2. What happens when you open (turn off) a switch in a simple series circuit: it creates a gap (open circuit) that stops the current flowing and turns the bulb off, or it makes the bulb brighter?
Cell (+) ── Switch ── (−) · Closed Series Loop
3. Which circuit instrument is connected IN PARALLEL across a component to measure the potential difference (voltage) in volts (V): a voltmeter or an ammeter?
Cell (+) ── Switch ── (−) · Closed Series Loop
4. What component has a resistance that changes significantly with temperature (used in digital thermometers and thermostats): a thermistor or a loudspeaker?
Cell (+) ── Switch ── (−) · Closed Series Loop
5. What is the role of the cell or battery in an electrical circuit: it provides the electrical energy (potential difference / voltage) that pushes charges around the circuit, or it absorbs light?
Cell (+) ── Switch ── (−) · Closed Series Loop
6. Why are the lights and sockets in a home wired in PARALLEL rather than in series: each light is on its own branch so it receives full voltage and can be switched on or off independently without turning off the others, or parallel uses no wire?
Cell (+) ── Switch ── (−) · Closed Series Loop
7. Which circuit instrument is connected IN SERIES in a loop to measure the electric current in amperes (A): an ammeter or a voltmeter?
Cell (+) ── Switch ── (−) · Closed Series Loop
8. In a simple SERIES circuit containing one battery and two bulbs, if you add a third identical bulb in the same single loop, what happens to the brightness of the bulbs: they become dimmer because the voltage is shared and total resistance increases, or they become three times brighter?
Cell (+) ── Switch ── (−) · Closed Series Loop
9. What safety device inside a plug or fusebox contains a thin wire designed to melt and break the circuit if the current becomes dangerously high: a fuse or a motor?
Cell (+) ── Switch ── (−) · Closed Series Loop
10. If you add a second cell in series (pointing in the same direction, + to −) to a circuit with a single bulb, what happens to the bulb: it shines more brightly because the voltage pushing the current has doubled, or it goes out?
Cell (+) ── Switch ── (−) · Closed Series Loop
11. Materials such as copper, aluminium, silver and steel that allow electric current to flow through them easily are called: electrical conductors or electrical insulators?
Cell (+) ── Switch ── (−) · Closed Series Loop
12. Which non-metal form of carbon (used in pencil leads) is an exception because it DOES conduct electricity: graphite or rubber?
Cell (+) ── Switch ── (−) · Closed Series Loop
12 questions · Seed 104732 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 7-9
Conductors, insulators & circuits
Answers and reasoning. Review before teaching.
1. In a standard circuit diagram, what does a long thin vertical line paired with a shorter, thicker vertical line represent: a single electrical cell, or an open switch?
Single electrical cell
The long line marks the positive (+) terminal and the short thick line marks the negative (−) terminal of a cell.
2. What happens when you open (turn off) a switch in a simple series circuit: it creates a gap (open circuit) that stops the current flowing and turns the bulb off, or it makes the bulb brighter?
It creates a gap (open circuit) that stops the current flowing and turns the bulb off
A switch controls a circuit by safely opening or closing the conducting gap.
3. Which circuit instrument is connected IN PARALLEL across a component to measure the potential difference (voltage) in volts (V): a voltmeter or an ammeter?
Voltmeter
A voltmeter has very high resistance and is connected across (in parallel with) a component.
4. What component has a resistance that changes significantly with temperature (used in digital thermometers and thermostats): a thermistor or a loudspeaker?
Thermistor
A thermistor is a temperature-sensitive resistor.
5. What is the role of the cell or battery in an electrical circuit: it provides the electrical energy (potential difference / voltage) that pushes charges around the circuit, or it absorbs light?
It provides the electrical energy (potential difference / voltage) that pushes charges around the circuit
A cell converts stored chemical energy into electrical energy.
6. Why are the lights and sockets in a home wired in PARALLEL rather than in series: each light is on its own branch so it receives full voltage and can be switched on or off independently without turning off the others, or parallel uses no wire?
Each light is on its own branch so it receives full voltage and can be switched on or off independently without turning off the others
In a parallel circuit, if one lamp fails or is switched off, current still flows through the other branches.
7. Which circuit instrument is connected IN SERIES in a loop to measure the electric current in amperes (A): an ammeter or a voltmeter?
Ammeter
An ammeter has very low resistance and is placed in series so all the current flows through it.
8. In a simple SERIES circuit containing one battery and two bulbs, if you add a third identical bulb in the same single loop, what happens to the brightness of the bulbs: they become dimmer because the voltage is shared and total resistance increases, or they become three times brighter?
They become dimmer because the voltage is shared and total resistance increases
In a series loop, adding more bulbs increases resistance and splits the battery voltage across more components.
9. What safety device inside a plug or fusebox contains a thin wire designed to melt and break the circuit if the current becomes dangerously high: a fuse or a motor?
Fuse
If a fault causes excessive current, the fuse wire melts, cutting off the electricity to prevent overheating and fire.
10. If you add a second cell in series (pointing in the same direction, + to −) to a circuit with a single bulb, what happens to the bulb: it shines more brightly because the voltage pushing the current has doubled, or it goes out?
It shines more brightly because the voltage pushing the current has doubled
Two 1.5 V cells connected correctly in series supply 3.0 V, increasing the current through the bulb.
11. Materials such as copper, aluminium, silver and steel that allow electric current to flow through them easily are called: electrical conductors or electrical insulators?
Electrical conductors
Metals have free-moving (delocalised) electrons that conduct electric current readily.
12. Which non-metal form of carbon (used in pencil leads) is an exception because it DOES conduct electricity: graphite or rubber?
Graphite
Graphite has delocalised electrons between its carbon layers, allowing it to conduct electricity.
12 questions · Seed 104732 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9
Conductors, insulators & circuits
Take your time. Show your thinking.
1. In a standard circuit diagram, what does a long thin vertical line paired with a shorter, thicker vertical line represent: a single electrical cell, or an open switch?
Cell (+) ── Switch ── (−) · Closed Series Loop
2. What happens when you open (turn off) a switch in a simple series circuit: it creates a gap (open circuit) that stops the current flowing and turns the bulb off, or it makes the bulb brighter?
Cell (+) ── Switch ── (−) · Closed Series Loop
3. Which circuit instrument is connected IN PARALLEL across a component to measure the potential difference (voltage) in volts (V): a voltmeter or an ammeter?
Cell (+) ── Switch ── (−) · Closed Series Loop
4. What component has a resistance that changes significantly with temperature (used in digital thermometers and thermostats): a thermistor or a loudspeaker?
Cell (+) ── Switch ── (−) · Closed Series Loop
5. What is the role of the cell or battery in an electrical circuit: it provides the electrical energy (potential difference / voltage) that pushes charges around the circuit, or it absorbs light?
Cell (+) ── Switch ── (−) · Closed Series Loop
6. Why are the lights and sockets in a home wired in PARALLEL rather than in series: each light is on its own branch so it receives full voltage and can be switched on or off independently without turning off the others, or parallel uses no wire?
Cell (+) ── Switch ── (−) · Closed Series Loop
7. Which circuit instrument is connected IN SERIES in a loop to measure the electric current in amperes (A): an ammeter or a voltmeter?
Cell (+) ── Switch ── (−) · Closed Series Loop
8. In a simple SERIES circuit containing one battery and two bulbs, if you add a third identical bulb in the same single loop, what happens to the brightness of the bulbs: they become dimmer because the voltage is shared and total resistance increases, or they become three times brighter?
Cell (+) ── Switch ── (−) · Closed Series Loop
9. What safety device inside a plug or fusebox contains a thin wire designed to melt and break the circuit if the current becomes dangerously high: a fuse or a motor?
Cell (+) ── Switch ── (−) · Closed Series Loop
10. If you add a second cell in series (pointing in the same direction, + to −) to a circuit with a single bulb, what happens to the bulb: it shines more brightly because the voltage pushing the current has doubled, or it goes out?
Cell (+) ── Switch ── (−) · Closed Series Loop
11. Materials such as copper, aluminium, silver and steel that allow electric current to flow through them easily are called: electrical conductors or electrical insulators?
Cell (+) ── Switch ── (−) · Closed Series Loop
12. Which non-metal form of carbon (used in pencil leads) is an exception because it DOES conduct electricity: graphite or rubber?
Cell (+) ── Switch ── (−) · Closed Series Loop
12 questions · Seed 104732 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9
Conductors, insulators & circuits
Answers and reasoning. Review before teaching.
1. In a standard circuit diagram, what does a long thin vertical line paired with a shorter, thicker vertical line represent: a single electrical cell, or an open switch?
Single electrical cell
The long line marks the positive (+) terminal and the short thick line marks the negative (−) terminal of a cell.
2. What happens when you open (turn off) a switch in a simple series circuit: it creates a gap (open circuit) that stops the current flowing and turns the bulb off, or it makes the bulb brighter?
It creates a gap (open circuit) that stops the current flowing and turns the bulb off
A switch controls a circuit by safely opening or closing the conducting gap.
3. Which circuit instrument is connected IN PARALLEL across a component to measure the potential difference (voltage) in volts (V): a voltmeter or an ammeter?
Voltmeter
A voltmeter has very high resistance and is connected across (in parallel with) a component.
4. What component has a resistance that changes significantly with temperature (used in digital thermometers and thermostats): a thermistor or a loudspeaker?
Thermistor
A thermistor is a temperature-sensitive resistor.
5. What is the role of the cell or battery in an electrical circuit: it provides the electrical energy (potential difference / voltage) that pushes charges around the circuit, or it absorbs light?
It provides the electrical energy (potential difference / voltage) that pushes charges around the circuit
A cell converts stored chemical energy into electrical energy.
6. Why are the lights and sockets in a home wired in PARALLEL rather than in series: each light is on its own branch so it receives full voltage and can be switched on or off independently without turning off the others, or parallel uses no wire?
Each light is on its own branch so it receives full voltage and can be switched on or off independently without turning off the others
In a parallel circuit, if one lamp fails or is switched off, current still flows through the other branches.
7. Which circuit instrument is connected IN SERIES in a loop to measure the electric current in amperes (A): an ammeter or a voltmeter?
Ammeter
An ammeter has very low resistance and is placed in series so all the current flows through it.
8. In a simple SERIES circuit containing one battery and two bulbs, if you add a third identical bulb in the same single loop, what happens to the brightness of the bulbs: they become dimmer because the voltage is shared and total resistance increases, or they become three times brighter?
They become dimmer because the voltage is shared and total resistance increases
In a series loop, adding more bulbs increases resistance and splits the battery voltage across more components.
9. What safety device inside a plug or fusebox contains a thin wire designed to melt and break the circuit if the current becomes dangerously high: a fuse or a motor?
Fuse
If a fault causes excessive current, the fuse wire melts, cutting off the electricity to prevent overheating and fire.
10. If you add a second cell in series (pointing in the same direction, + to −) to a circuit with a single bulb, what happens to the bulb: it shines more brightly because the voltage pushing the current has doubled, or it goes out?
It shines more brightly because the voltage pushing the current has doubled
Two 1.5 V cells connected correctly in series supply 3.0 V, increasing the current through the bulb.
11. Materials such as copper, aluminium, silver and steel that allow electric current to flow through them easily are called: electrical conductors or electrical insulators?
Electrical conductors
Metals have free-moving (delocalised) electrons that conduct electric current readily.
12. Which non-metal form of carbon (used in pencil leads) is an exception because it DOES conduct electricity: graphite or rubber?
Graphite
Graphite has delocalised electrons between its carbon layers, allowing it to conduct electricity.
12 questions · Seed 104732 · Age guidance, not curriculum certification