Chapter 2 - Electricity

Question 1

What are the units for potential difference?

Answer 1

Volts (V)

Question 2

What are the units for current?

Answer 2

Amps (A)

Question 3

What are the units for power?

Answer 3

Watts (W)

Question 4

What are the units for charge?

Answer 4

Coulombs (C)

Question 5

What are the units for resistance?

Answer 5

Ohms (Ω)

Question 6

What is the equation linking power, current and voltage?

Answer 6

Power = Current x Voltage
P = I x V

Question 7

What is the equation linking resistance, current and voltage?

Answer 7

Resistance = Voltage / Current
R = V/I

Question 8

What device is used to measure current and how is it connected?

Answer 8

An ammeter connected in series

Question 9

What device is used to measure voltage and how is it connected?

Answer 9

A voltmeter connected in parallel with the component

Question 10

What is meant by an “Ohmic conductor”?

Answer 10

A conductor that has a constant resistance

Question 11

How can you tell from a voltage-current graph if a conductor is Ohmic?

Answer 11

It has a straight line going through the origin.

Voltage and Current are directly proportional to each other