4.2 potential difference and resistance

Question 1

Is the current same throughout a series circuit or different

Answer 1

same

Question 2

1mA in Amps

Answer 2

0.001

Question 3

What is potential difference

Answer 3

Energy transferred to the bulb or the work done

Question 4

Potential difference across a component using energy transferred and charge

Answer 4

energy transferred (J) / charge (C)

Question 5

Resistance =

Answer 5

potential difference / current

Question 6

When there is a larger resistance is the current bigger or smaller

Answer 6

smaller

Question 7

What is Ohms law

Answer 7

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

Question 8

What is an ohmic conductor

Answer 8

Resistance stays constant as the current changes

Question 9

On a graph with p.d. on x axis and current on y axis, will resistance be greater when the gradient is steeper or less steep?

Answer 9

less steep

Question 10

What is a non ohmic conductor

Answer 10

The resistance doesn’t stay constant as the current changes

Question 11

Does resistance increase or decrease as the temperature increases and why?

Answer 11

• If the temperature of a metal conductor increases, the ions of the metal vibrate more vigorously.
• This increases the number of collisions between the
  free electrons and the ions.
• Hence, for a metal, resistance increases with increasing temperature.