Compare conductors and insulators, series and parallel circuits, switches, fuses and circuit symbols. Review suitability for your learners before teaching.
Choose “Save as PDF” to keep a copy. Use your browser’s paper setting for A4 or Letter.
Worksheet StudioPractice pack · Ages 10-12
Conductors, insulators & circuits
Take your time. Show your thinking.
1. 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
2. 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
3. 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
4. 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
5. Why should you NEVER touch mains electrical switches, plugs or sockets with wet hands: tap water contains dissolved salts (ions) that conduct electricity and can cause a dangerous electric shock, or water freezes the switch?
Cell (+) ── Switch ── (−) · Closed Series Loop
6. 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
7. 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
8. 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
9. 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
10. 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
11. 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
12. In a standard circuit diagram, what component is represented by a circle with an “X” (cross) inside it: a filament lamp (bulb) or a battery?
Cell (+) ── Switch ── (−) · Closed Series Loop
12 questions · Seed 104731 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 10-12
Conductors, insulators & circuits
Answers and reasoning. Review before teaching.
1. 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.
2. 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.
3. 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.
4. 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.
5. Why should you NEVER touch mains electrical switches, plugs or sockets with wet hands: tap water contains dissolved salts (ions) that conduct electricity and can cause a dangerous electric shock, or water freezes the switch?
Tap water contains dissolved salts (ions) that conduct electricity and can cause a dangerous electric shock
Impure water is an electrical conductor and lowers the electrical resistance of skin.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
11. 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.
12. In a standard circuit diagram, what component is represented by a circle with an “X” (cross) inside it: a filament lamp (bulb) or a battery?
Filament lamp (bulb)
A circle containing a cross is the standard circuit symbol for an indicator or lighting lamp.
12 questions · Seed 104731 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12
Conductors, insulators & circuits
Take your time. Show your thinking.
1. 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
2. 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
3. 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
4. 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
5. Why should you NEVER touch mains electrical switches, plugs or sockets with wet hands: tap water contains dissolved salts (ions) that conduct electricity and can cause a dangerous electric shock, or water freezes the switch?
Cell (+) ── Switch ── (−) · Closed Series Loop
6. 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
7. 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
8. 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
9. 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
10. 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
11. 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
12. In a standard circuit diagram, what component is represented by a circle with an “X” (cross) inside it: a filament lamp (bulb) or a battery?
Cell (+) ── Switch ── (−) · Closed Series Loop
12 questions · Seed 104731 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12
Conductors, insulators & circuits
Answers and reasoning. Review before teaching.
1. 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.
2. 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.
3. 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.
4. 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.
5. Why should you NEVER touch mains electrical switches, plugs or sockets with wet hands: tap water contains dissolved salts (ions) that conduct electricity and can cause a dangerous electric shock, or water freezes the switch?
Tap water contains dissolved salts (ions) that conduct electricity and can cause a dangerous electric shock
Impure water is an electrical conductor and lowers the electrical resistance of skin.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
11. 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.
12. In a standard circuit diagram, what component is represented by a circle with an “X” (cross) inside it: a filament lamp (bulb) or a battery?
Filament lamp (bulb)
A circle containing a cross is the standard circuit symbol for an indicator or lighting lamp.
12 questions · Seed 104731 · Age guidance, not curriculum certification