Circuits
What is a circuit?
A closed loop through which electric current can flow.
What is a conductor?
A material that allows electricity to flow easily.
What is an insulator?
A material that does not easily allow electricity to flow.
What unit is used to measure electric current?
Ampere (Amp).
What will happen to the brightness of a bulb if more bulbs are added in series?
The bulbs will become dimmer.
What happens if a circuit is not complete?
The current will not flow.
What is the best metal conductor of electricity?
Silver.
What is a common insulating material used to coat electrical wires?
Plastic.
What device is used to measure electric current?
Ammeter.
What do we call a circuit where electricity can flow without stopping?
A closed circuit.
What is the purpose of a battery in a circuit?
To provide energy for the current to flow.
What metal is commonly used in wires because it is a good conductor and affordable?
Copper.
What natural insulator is often used in oven mitts?
Rubber.
What circuit component controls the flow of current by adding resistance?
Resistor.
Why do power lines use metal wires instead of plastic?
Metal is a good conductor of electricity.
How do you know if a circuit is complete?
A) Switch is closed
B)Bulb is off
C)Switch is open
D)There is an ammenter
What liquid is a good conductor because it contains dissolved salts?
Saltwater.
What gas is an excellent insulator and prevents electrical sparks in power lines?
Air.
What tool is used to measure voltage, resistance, and current?
Multimeter.
Why do electricians wear rubber gloves when working with wires?
Rubber is an insulator and prevents electric shocks.
What is a switch?
A device used to open or close a circuit.
Which of these is a conductor?
A)Rubber
B)Plastic
C)Copper
D)Wood
Which of these is an insulator?
A)Nickel
B)Iron
C)Aluminium
D)Rubber
What law relates voltage, current, and resistance?
Ohm’s Law.
What is one reason why plastic is used to coat electrical wires?
It prevents electric shocks.