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. What component has a resistance that decreases when brighter light shines on it (used in automatic street lights): a light-dependent resistor (LDR) or a thermistor?
Cell (+) ── Switch ── (−) · Closed Series Loop
2. Materials such as plastic, rubber, glass and dry wood that do NOT allow electric current to flow through them are called: electrical insulators or electrical conductors?
Cell (+) ── Switch ── (−) · Closed Series Loop
3. In a parallel circuit, how does the total current leaving the battery compare to the currents in the individual parallel branches: the total current equals the sum of the currents in the branches, or the total current is zero?
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 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
6. What happens if two identical cells in a torch are put in facing opposite directions (+ touching +): their voltages cancel out and the bulb will not light, or the bulb shines twice as bright?
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. For an electric current to flow and light up a bulb, what kind of path must the circuit form from one terminal of the battery to the other: a complete (closed) loop with no gaps, or a broken (open) loop?
Cell (+) ── Switch ── (−) · Closed Series Loop
9. 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
10. 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
11. In a series circuit, how does the electric current measured at different points around the single loop compare: the current is the SAME at every point in a series loop, or it gets used up by the bulb?
Cell (+) ── Switch ── (−) · Closed Series Loop
12. What circuit component allows current to flow in ONE direction only (and emits light when it is an LED): a diode (or light-emitting diode) or a fixed resistor?
Cell (+) ── Switch ── (−) · Closed Series Loop
12 questions · Seed 65 · 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. What component has a resistance that decreases when brighter light shines on it (used in automatic street lights): a light-dependent resistor (LDR) or a thermistor?
Light-dependent resistor (LDR)
In bright light an LDR’s resistance falls; in darkness its resistance rises.
2. Materials such as plastic, rubber, glass and dry wood that do NOT allow electric current to flow through them are called: electrical insulators or electrical conductors?
Electrical insulators
Insulators have tightly bound electrons and block the flow of electric current.
3. In a parallel circuit, how does the total current leaving the battery compare to the currents in the individual parallel branches: the total current equals the sum of the currents in the branches, or the total current is zero?
The total current equals the sum of the currents in the branches
By Kirchhoff’s current law (conservation of charge), current splits at a junction and recombines on return.
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 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.
6. What happens if two identical cells in a torch are put in facing opposite directions (+ touching +): their voltages cancel out and the bulb will not light, or the bulb shines twice as bright?
Their voltages cancel out and the bulb will not light
Cells in series must be aligned positive-to-negative so their voltages add together.
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. For an electric current to flow and light up a bulb, what kind of path must the circuit form from one terminal of the battery to the other: a complete (closed) loop with no gaps, or a broken (open) loop?
A complete (closed) loop with no gaps
Current only flows around a continuous, closed conducting pathway.
9. 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.
10. 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.
11. In a series circuit, how does the electric current measured at different points around the single loop compare: the current is the SAME at every point in a series loop, or it gets used up by the bulb?
The current is the SAME at every point in a series loop
Charge is conserved—the same number of coulombs per second passes every point in a single loop; energy is transferred, not current used up.
12. What circuit component allows current to flow in ONE direction only (and emits light when it is an LED): a diode (or light-emitting diode) or a fixed resistor?
Diode (or light-emitting diode)
A diode has low resistance in the forward direction and very high resistance in reverse.
12 questions · Seed 65 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9
Conductors, insulators & circuits
Take your time. Show your thinking.
1. What component has a resistance that decreases when brighter light shines on it (used in automatic street lights): a light-dependent resistor (LDR) or a thermistor?
Cell (+) ── Switch ── (−) · Closed Series Loop
2. Materials such as plastic, rubber, glass and dry wood that do NOT allow electric current to flow through them are called: electrical insulators or electrical conductors?
Cell (+) ── Switch ── (−) · Closed Series Loop
3. In a parallel circuit, how does the total current leaving the battery compare to the currents in the individual parallel branches: the total current equals the sum of the currents in the branches, or the total current is zero?
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 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
6. What happens if two identical cells in a torch are put in facing opposite directions (+ touching +): their voltages cancel out and the bulb will not light, or the bulb shines twice as bright?
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. For an electric current to flow and light up a bulb, what kind of path must the circuit form from one terminal of the battery to the other: a complete (closed) loop with no gaps, or a broken (open) loop?
Cell (+) ── Switch ── (−) · Closed Series Loop
9. 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
10. 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
11. In a series circuit, how does the electric current measured at different points around the single loop compare: the current is the SAME at every point in a series loop, or it gets used up by the bulb?
Cell (+) ── Switch ── (−) · Closed Series Loop
12. What circuit component allows current to flow in ONE direction only (and emits light when it is an LED): a diode (or light-emitting diode) or a fixed resistor?
Cell (+) ── Switch ── (−) · Closed Series Loop
12 questions · Seed 65 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9
Conductors, insulators & circuits
Answers and reasoning. Review before teaching.
1. What component has a resistance that decreases when brighter light shines on it (used in automatic street lights): a light-dependent resistor (LDR) or a thermistor?
Light-dependent resistor (LDR)
In bright light an LDR’s resistance falls; in darkness its resistance rises.
2. Materials such as plastic, rubber, glass and dry wood that do NOT allow electric current to flow through them are called: electrical insulators or electrical conductors?
Electrical insulators
Insulators have tightly bound electrons and block the flow of electric current.
3. In a parallel circuit, how does the total current leaving the battery compare to the currents in the individual parallel branches: the total current equals the sum of the currents in the branches, or the total current is zero?
The total current equals the sum of the currents in the branches
By Kirchhoff’s current law (conservation of charge), current splits at a junction and recombines on return.
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 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.
6. What happens if two identical cells in a torch are put in facing opposite directions (+ touching +): their voltages cancel out and the bulb will not light, or the bulb shines twice as bright?
Their voltages cancel out and the bulb will not light
Cells in series must be aligned positive-to-negative so their voltages add together.
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. For an electric current to flow and light up a bulb, what kind of path must the circuit form from one terminal of the battery to the other: a complete (closed) loop with no gaps, or a broken (open) loop?
A complete (closed) loop with no gaps
Current only flows around a continuous, closed conducting pathway.
9. 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.
10. 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.
11. In a series circuit, how does the electric current measured at different points around the single loop compare: the current is the SAME at every point in a series loop, or it gets used up by the bulb?
The current is the SAME at every point in a series loop
Charge is conserved—the same number of coulombs per second passes every point in a single loop; energy is transferred, not current used up.
12. What circuit component allows current to flow in ONE direction only (and emits light when it is an LED): a diode (or light-emitting diode) or a fixed resistor?
Diode (or light-emitting diode)
A diode has low resistance in the forward direction and very high resistance in reverse.
12 questions · Seed 65 · Age guidance, not curriculum certification