2.1.3 & 2.1.4 Current, Resistance And Potential Difference & Resistors

Question 1

Link between current and p.d./voltage

Answer 1

As the voltage increases, so does the current

Question 2

Link between current and resistance

Answer 2

As the resistance increases, the charge decreases

Question 3

V = I R

Answer 3

Potential difference = current × resistance

Question 4

I

Answer 4

Current

Question 5

V

Answer 5

Potential difference

Question 6

R

Answer 6

Resistance

Question 7

Potential difference units

Answer 7

Volts (V)

Question 8

Current units

Answer 8

Amperes (A)

Question 9

Resistance units

Answer 9

Ohms (Ω)

Question 10

How to place voltmeter in a circuit

Answer 10

In parallel with the component where the voltmeter is measuring the p.d.

Question 11

1 volt

Answer 11

1 joule per coulomb

Question 12

A short circuit

Answer 12

Connect one side of the component to the other side using a piece of wire

Question 13

How does the resistance of a thermistor change as the temperature increases?

Answer 13

decreases

Question 14

Hoe does the resistance of an LDR change as the light intensity increases?

Answer 14

decreases

Question 15

How to measure resistance (3p)

Answer 15

• ammeter in series with the component
• voltmeter in parallel with the component
• V = IR