GROL Electrical Principles and Units 2

Question 1

A resistor dissipates 50 watts with 10 volts across it. What is the current through the resistor?

Accepted Answer

5 A

Answer

Using P = IV, rearranged as I = P/V = 50/10 = 5 A.

Question 2

Three resistors of 10 Ω, 20 Ω, and 30 Ω are connected in series. What is the total resistance?

Accepted Answer

60 Ω

Answer

Series resistances add directly: 10 + 20 + 30 = 60 Ω.

Question 3

Two 100-ohm resistors are connected in parallel. What is the total resistance?

Accepted Answer

50 Ω

Answer

For two equal parallel resistors, Rp = R/2 = 100/2 = 50 Ω.

Question 4

A 2 kΩ and 8 kΩ resistor are connected in series across 100 V as a voltage divider. What is the voltage across the 2 kΩ resistor?

Accepted Answer

20 V

Answer

V = Vsupply × R1/(R1+R2) = 100 × 2000/10000 = 20 V.

Question 5

A 12 V supply is connected to a 4 Ω and a 6 Ω resistor in parallel. What is the total current from the supply?

Accepted Answer

5 A

Answer

I1 = 12/4 = 3 A, I2 = 12/6 = 2 A; total current = 3 + 2 = 5 A.

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