Electricity Flashcards
1
Q
What is an insulator?
A
Stops electric flow.
2
Q
What is a conductor?
A
Allows electric flow.
3
Q
How does a switch stop a flow?
A
When it is opened, it disconnects the wires / breaks the circuit.
4
Q
What does an ammeter measure?
A
Amps. Electric current.
5
Q
What does a voltmeter measure?
A
Voltage. Potential difference.
6
Q
A 9V torch produces a current of 1A. What is the resistance of the torch?
A
R=V/I = 9V/1A = 9Ω
7
Q
V = I x R = 2A x 6Ω = ?
A
12 V
8
Q
I = V/R = 240V/20Ω = ?
A
12 A
