Physics

Question 1

What is Resistance measured in?

Answer 1

Ohms

Question 2

What is the driving force that pushes current round a circuit?

Answer 2

Potential difference

Question 3

What is an insulator?

Answer 3

An insulator is a material that doesn’t easily allow electric charges to pass through it, e.g. wood, plastic

Question 4

What do ammeters and voltmeters measure?

Answer 4

Ammeters measure current, voltmeters measure potential difference

Question 5

What is a battery rating and what is a bulb rating?

Answer 5

A battery rating tells you the potential difference it will supply whereas a bulb rating tells you the maximum potential difference that you can safely put across it.

Question 6

Why is a parallel circuit more useful than a series circuit?

Answer 6

Because the devices in it can be operated independently.

Question 7

At low temperatures what is the resistance of a thermistor?

Answer 7

High (and little current can flow through them)

Question 8

At high temperatures what is the resistance of a thermistor?

Answer 8

Low (and more current can flow through them)

Question 9

What are thermistors?

Answer 9

An electrical resistor which is greatly reduced by heating, used for measurement and control

Question 10

What do resistors do?

Answer 10

Resistors restrict or limit the flow of current in a circuit.