Circuit Components
What is the function of a switch?
A switch opens or closes a circuit
Name a good conductor
Metal (e.g., copper)
What is a series circuit?
All components are connected in one loop.
What form of energy does a toaster produce?
Heat and light
Why should you not use wet hands near electricity?
Water conducts electricity and could cause shock.
Draw the symbol of a lightbulb
Circle with X in it
Name an insulator used around electrical wires
Plastic or rubber.
What is a parallel circuit?
Components are connected on separate branches.
What energy is stored in a battery?
Chemical energy.
What does a circuit breaker do?
It automatically switches off power when too much current flows.
What does a resistor do?
A resistor reduces the flow of electric current.
Why is copper used in wiring?
It’s a good conductor and flexible, making it ideal for wires.
Which circuit allows devices to work independently?
A parallel circuit.
What energy transfer happens in a light bulb?
Electrical → light + heat energy.
Name a place in the home where safety switches are installed
In the switchboard or fuse box.
What is the purpose of a fuse?
A fuse protects the circuit by melting and breaking the circuit if too much current flows.
How do insulators help keep us safe?
They prevent electric shocks by stopping current from passing through to people.
Why does a bulb shine brighter in a parallel circuit?
Because each bulb gets full voltage from the battery.
Explain how energy is transformed in a hairdryer
Electrical → heat + sound + kinetic energy.
How can a damaged cord be dangerous
It can expose wires and cause shocks, fires, or short circuits.
Explain the difference between a cell and a battery
A cell provides one unit of electrical energy; a battery is a group of cells joined together.
Test: Which of these are conductors: plastic, metal, wood, glass?
Metal is a conductor. (Plastic, wood, and glass are insulators.)
Draw a series circuit with two bulbs.
Two bulbs in one loop.
Give 3 examples of devices that transform electrical energy.
Toaster, lamp, fan.
List 3 electricity safety rules to follow in a science lab.
Don’t touch equipment with wet hands, check wires for damage, turn off switches when not in use.