4.2 potential difference and resistance

Question 1

What is the equation for the potential difference across the component?

Answer 1

Component, V = energy transferred E / charge, Q

Question 2

What is the equation for resistance of an electrical component?

Answer 2

Resistance, R = potential difference, V / current, I

Question 3

What does Ohm’s law state?

Answer 3

That the current through a resistor at constant temperature is the same as the potential difference across the resistor

Question 4

What does reversing the potential difference across a resistor do?

Answer 4

Reverses the current through it

Question 5

What does V stand for?

Answer 5

Potential difference across the component (volts, V)

Question 6

What does E represent?

Answer 6

Energy transferred (joules, J)

Question 7

What does Q represent?

Answer 7

Charge (coulombs, C)

Question 8

What does R represent?

Answer 8

Resistance (ohm’s)

Question 9

What does I stand for?

Answer 9

Current (amperes, A)

Question 10

What does a series mean?

Answer 10

Components connected in a circuit that allows current to pass through them

Question 11

What is potential difference?

Answer 11

A measure of the work done or energy transferred to the lamp by each coulomb of charge the passes through it

Question 12

What does parallel mean?

Answer 12

Components connected in the circuit so that the potential difference is the same across each one