Current And Potential Difference

Question 1

What is current?

Answer 1

Current is the flow of electric charge. Unit A

Question 2

What is potential difference?

Answer 2

Is the driving force that pushes charge around or energy transferred per coulomb of charge. Unit V

Question 3

What is resistance?

Answer 3

Is anything that slows the flow down. Unit o

Question 4

What is charge?

Answer 4

Is the flow of electric charge over time.

Question 5

How does temperature change with resistance?

Answer 5

Resistance increases with temperature, because the electrical charge has to work against the resistor causing an electrical transfer- some of this is useful but other parts are dissipated to the thermal energy stores. So when a current flows through a resistor, the resistor heats up. If the resistor gets too hot no current will flow through.

Question 6

I-v graphs for filament lamp, diode and resistors

Answer 6

Look at book

Question 7

What is an LDR?

Answer 7

It is a resistor that is dependent on the intensity of light, bright light the resistance falls and in darkness it is higher.

Question 8

What is a thermistor?

Answer 8

It is a temperature dependant resistor, in hot conditions the resistance drops and when in cool conditions the resistance goes up.