Units and measurements

Question 1

What unit is used to measure electric current?

Answer 1

Amps (A) and milliamps (mA).

Question 2

What is 1 amp equal to in milliamps?

Answer 2

1000 milliamps.

Question 3

What unit is used to measure voltage?

Answer 3

Volts (V) and millivolts (mV).

Question 4

What is 1 volt equal to in millivolts?

Answer 4

1000 millivolts.

Question 5

What unit is used to measure resistance?

Answer 5

Ohms (Ω), kilohms (kΩ), and mega-ohms (MΩ).

Question 6

What is 1 kilohm equal to?

Answer 6

1000 ohms.

Question 7

What is 1 mega-ohm equal to?

Answer 7

1,000,000 ohms.

Question 8

What is Ohm’s Law formula?

Answer 8

V = I × R (Voltage = Current × Resistance).

Question 9

If current (I) is 2 A and resistance (R) is 5 Ω, what is the voltage (V)?

Answer 9

V = 2 × 5 = 10 volts.

Question 10

If voltage (V) is 12 V and resistance (R) is 4 Ω, what is the current (I)?

Answer 10

I = V ÷ R = 12 ÷ 4 = 3 amps.

Question 11

If voltage (V) is 9 V and current (I) is 3 A, what is the resistance (R)?

Answer 11

R = V ÷ I = 9 ÷ 3 = 3 ohms.