8.2.2 Simple Circuits

Question 1

What is Resistance?

Answer 1

Resistance is the measure of how difficult it is for electrons to move through it. eg. squeezing a hose creates resistance of the water flow.

Question 2

Resistance is measured in:

Answer 2

Ohms. Ω

Question 3

What does resistance affect?

Answer 3

Voltage & Current.

Question 4

Resistors control the current by:

Answer 4

Reducing the size of the current.

Question 5

The coloured rings on resistors indicate what?

Answer 5

The value of resistance in Ohms. Ω

Question 6

As the voltage goes up the current:

Answer 6

Increases.

Question 7

As the resistance goes up the current:

Answer 7

Decreases.

Question 8

What do I, V and R stand for in Ohms law?

Answer 8

I = Current/Intensity of current (A)
V = Voltage (V)
R = Resistance (Ω)

Question 9

What is the current in a 240 V circuit if the resistance is 30 Ω?
V = I×R I=V÷R R=V÷I

Answer 9

8 A

Question 10

What is the current in a 16 V circuit if the resistance is 5 Ω?
V = I×R I=V÷R R=V÷I

Answer 10

3.2 A

Question 11

What is the voltage in a circuit element if its resistance is 100 Ω and the current through it is 5A?
V = I×R I=V÷R R=V÷I

Answer 11

500 V

Question 12

What is the resistance of a circuit if the applied voltage is 240V and the current flowing through is 2A?
V = I×R I=V÷R R=V÷I

Answer 12

120 R