Resistance and V=IR

Question 1

What does the ammeter measure?

Answer 1

current (amps)

Question 2

What does the voltmeter measure?

Answer 2

potential difference

Question 3

How do you investigate the factors affecting resistance?

Answer 3

1) Attach a crocodile clip on to the wire with cm by the ruler
2) put the other clip 10cm away from the first crocodile clip on the wire
3) Close the switch and measure the length, current, and potential difference
4) open the switch and move the crocodile clip 10 mire cm away
5) close the switch and measure the length, current, and potential difference
6) repeat the steps using different lengths

Question 4

If the resistance stays constant and you increase the voltage what happens to the current

Answer 4

It increases proportionally

Question 5

smaller resistance steep or not steep

Answer 5

steep

Question 6

What would happen in terms of the resistance if the temperature heats up

Answer 6

the resistance will increase

Question 7

How do filament lamps work

Answer 7

Filament lamps are light bulbs with a thin filament wire inside. As the current flows through the filament, the wire heats up until it produces light. This increases the resistance and that is the line is less steep

Question 8

How do diode work

Answer 8

they are devices that only allow current to flow in one direction which is why the resistance is only shown in the positive part. This is done by having a high resistance in the negative part so no current can flow there