Potential difference and resistance

Question 1

What does a voltmeter measure?

Answer 1

Potential difference

Potential difference is the energy transferred to the bulb or the work done on it by each coulomb of charge that passes through it.

Question 2

What is resistance?

Answer 2

The opposition to the passage of electrons

Atoms resist the passage of electrons as they vibrate in the metal filament.

Question 3

What unit is resistance measured in?

Answer 3

Ohms

Question 4

What effect does a resistor in a circuit have?

Answer 4

Limits the current

Question 5

How does resistance affect current for a given potential difference?

Answer 5

Larger resistance results in smaller current

Question 6

What does Ohm’s Law state?

Answer 6

The current through a resistor at a constant temperature is directly proportional to the potential difference across the resistor

Question 7

Fill in the blank: The current through a resistor at a current temperature is directly proportional to the _______ across the resistor.

Answer 7

[potential difference]