BMST Electrical Circuits and Ohm's Law 5

Question 1

A fuse is rated at 5 A. What is its primary function in a circuit?

Accepted Answer

Protect against excessive current

Answer

A fuse melts and breaks the circuit if current exceeds its rated value, protecting components.

Question 2

Three 12 Ω resistors are connected in parallel. What is the equivalent resistance?

Accepted Answer

4 Ω

Answer

For N equal resistors in parallel, R_eq = R/N = 12/3 = 4 Ω.

Question 3

How much energy does a 100 W appliance use in 2 hours?

Accepted Answer

720,000 J

Answer

Energy = Power × Time = 100 W × 7200 s = 720,000 J.

Question 4

Which circuit configuration ensures that all components receive the same voltage?

Accepted Answer

Parallel circuit

Answer

In a parallel circuit, each branch is connected directly to the source, so all branches share the same voltage.

Question 5

A 5 Ω and 20 Ω resistor are in series with a 50 V source. What is the voltage drop across the 20 Ω resistor?

Accepted Answer

40 V

Answer

Total R = 25 Ω; I = 50/25 = 2 A; V = 2 × 20 = 40 V across the 20 Ω resistor.

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