Current Potential Diffference Graphs

Question 1

What is a current potential difference graph?

Answer 1

It shows how the current through a component varies with potential difference across it
Linear through the origin
Current is directly proportional to potential difference
Current through a resistor is directly proportional to the potential difference across the resistor at a constant temperature

Question 2

Explain the graph of resistors against potential difference?

Answer 2

A graph of current against potential difference shows how current flowing through a component varies with the potential difference across it
It is directly proportional

Question 3

Explain the filament lamp graph?

Answer 3

Common type of light bulb
Thin coil of wire called filament
It heats up when electric current passes through it and produces light as a result

Question 4

Explain the diode graph?

Answer 4

Diodes are electric components used to regulate the potential difference in circuits
The diode has high resistance in one direction only
Current can only flow in the other direction

Question 5

Explain the thermistor graph?

Answer 5

Used as temperature sensors eg fire alarms

Resistance decreases as temperature increases

Question 6

Explain the LDR graph?

Answer 6

Light dependant resistor
Used to detect light levels eg automatic security lights
Resistance decreases as light intensity increases