P4 Science · Chapter 11brightbit.net/worksheets
Electrical Systems — Circuits
Name: ______________________Class: ________Date: ____________Score: ____ / 10
- 1.
Which of the following is needed to make a complete electrical circuit?
(a) A battery, wire, and a switch only(b) A continuous path from one terminal of the battery, through components, back to the other terminal(c) Only a battery and a bulb touching each other(d) Any metal object connected to a battery
- 2.
What happens to the bulbs in a series circuit when one bulb is removed?
(a) Only the removed bulb goes out; the others stay on(b) All bulbs go out because the circuit is broken(c) The remaining bulbs become brighter(d) The remaining bulbs become dimmer but stay on
- 3.
In a parallel circuit, what happens to the other bulbs if one bulb is removed?
(a) All bulbs go out(b) The other bulbs remain lit because each bulb has its own path(c) The other bulbs become dimmer(d) The battery runs out faster
- 4.
What is the function of a switch in an electrical circuit?
(a) To increase the current in the circuit(b) To open or close the circuit, controlling whether current flows(c) To store electrical energy(d) To convert electrical energy into light
- 5.
What does a battery do in an electrical circuit?
(a) It stores light energy(b) It provides the electrical energy (electromotive force) to push current around the circuit(c) It slows down the current(d) It converts electrical energy into chemical energy only
- 6.
A student connects two batteries in series (end to end) in a circuit with one bulb. What happens compared to one battery?
(a) The bulb becomes dimmer(b) The bulb becomes brighter because the circuit receives more voltage(c) Nothing changes(d) The bulb flashes on and off
- 7.
Which of the following correctly describes an open circuit?
(a) A circuit with more than one bulb(b) A circuit where the path for current is broken and no current flows(c) A circuit that uses alternating current(d) A circuit with no battery
- 8.
Two bulbs are connected in series with a battery. A third bulb is now added to the series. What happens to the original two bulbs?
(a) They become brighter(b) They become dimmer because the resistance increases(c) They remain the same brightness(d) One becomes brighter and one becomes dimmer
- 9.
Name TWO differences between a series circuit and a parallel circuit.
- 10.
A torch uses two batteries connected in series and two bulbs connected in parallel. One bulb burns out. What happens to the other bulb? Explain.
Answer key — P4 Science: Electrical Systems — Circuits
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- 1.(b) A continuous path from one terminal of the battery, through components, back to the other terminal
- 2.(b) All bulbs go out because the circuit is broken
- 3.(b) The other bulbs remain lit because each bulb has its own path
- 4.(b) To open or close the circuit, controlling whether current flows
- 5.(b) It provides the electrical energy (electromotive force) to push current around the circuit
- 6.(b) The bulb becomes brighter because the circuit receives more voltage
- 7.(b) A circuit where the path for current is broken and no current flows
- 8.(b) They become dimmer because the resistance increases
- 9.series has one path for current; parallel has multiple paths — in series all components go out if one breaks; in parallel the rest continue to work
- 10.the other bulb remains lit because they are connected in parallel and each bulb has its own independent path for current
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