Resistance

Question 1

what is resistance?

Answer 1

anything that will slow down or stop a current

Question 2

what is resistance measured in?

Answer 2

Ohms ⎍

Question 3

equation for resistance

Answer 3

resistance = voltage - V
———————–
current - A

Question 4

what other letter symbol is also for current?

Answer 4

I

Question 5

resistance …. …. …. in a resistor

Answer 5

stays the same

Question 6

resistance … … on the bulb because it gets … and …

Answer 6

goes up

brighter & hotter

Question 7

what does the resistantance of a resistor graph look like?

Answer 7

a diagonal line across ➡️ R constant

Question 8

what does the resistance of a bulb graph look like?

Answer 8

a straight line that then curves up and around to straight again ➡️ R increases

Question 9

resistance of a diode graph

Answer 9

straight line across graph that then curves straight up ➡️ R decreases

Question 10

pros and cons of a LED

Answer 10

✔️more efficient 
✔️lasts longer
✔️if 1 bulb breaks, all the others stay on
❌more expensive
❌small

Question 11

what happens to the light and resistance of a LDR?

Answer 11

light increases

resistance decreases

Question 12

what are LED lights used for?

Answer 12

• traffic lights
• torches
• head car lights