P4.3 Potential difference and resistance

Question 1

What is the definition of potential difference?

Answer 1

Potential difference is the work done per unit charge to move a charge between two points in an electric field.

Question 2

True or False: Potential difference is measured in volts.

Answer 2

True

Question 3

What is the formula for calculating potential difference?

Answer 3

The formula is V = W/Q, where V is potential difference, W is work done, and Q is charge.

Question 4

Fill in the blank: The unit of resistance is __________.

Answer 4

ohm

Question 5

What is Ohm’s Law?

Answer 5

Ohm’s Law states that the current through a conductor between two points is directly proportional to the potential difference across the two points.

Question 6

If the potential difference is doubled, what happens to the current if the resistance remains constant?

Answer 6

The current is also doubled.

Question 7

Multiple Choice: Which of the following equations represents Ohm’s Law? A) V = I × R B) V = R/I C) V = I + R

Answer 7

A) V = I × R

Question 8

What is the relationship between resistance, voltage, and current?

Answer 8

Resistance is equal to the potential difference divided by the current (R = V/I).

Question 9

True or False: A higher resistance means less current flows for a given potential difference.

Answer 9

True

Question 10

What does a voltmeter measure?

Answer 10

A voltmeter measures the potential difference between two points in a circuit.