P4.3 - Potential Difference And Resistance (Finished)

Question 1

What is current measured din?

Answer 1

Amperes, A

Question 2

What is the formula linking potential difference, current and resistance?

Answer 2

Potential difference = current * resistance

Question 3

What is the formula that links potential difference, energy transferred and charge?

Answer 3

Potential difference across a component = energy transferred (J) * charge (C)

Question 4

What is resistance caused by?

Answer 4

Electrons passing through a (e.g. bulb) have to push their way past lots of vibrating atoms. These atoms resist the passage of electrons through the component.

Question 5

What is an ohmic conductor?

Answer 5

Ohmic conductors are conductors that don’t change in resistance as current changes, provided a constant temperature

Question 6

At a constant temperature, how can the curent flowing through an ohmic conductor be found?

Answer 6

At a constant temperature, the current flowing through an ohmic conductor is directly proportional to the potential difference across it

Question 7

What dare some examples of ohmic conductors?

Answer 7

Wires, resitors

Question 8

What does ohms law state?

Answer 8

Ohms law states that the current flowing through a resistor at a constant temperature is directly proportional to the potential difference across it