Polytechnic Electronics and Electrical Engineering

Question 1

Which law states that the current through a conductor is directly proportional to the voltage across it, given constant temperature?

Accepted Answer

Ohm's Law

Answer

Ohm's Law states V = IR, meaning current is directly proportional to voltage when resistance is constant.

Question 2

What is the unit of electrical resistance?

Accepted Answer

Ohm

Answer

Electrical resistance is measured in Ohms (Ω), named after physicist Georg Simon Ohm.

Question 3

Three resistors of 6Ω each are connected in parallel. What is the equivalent resistance?

Accepted Answer

2Ω

Answer

For N equal resistors in parallel, equivalent resistance = R/N = 6/3 = 2Ω.

Question 4

What type of component stores energy in an electric field?

Accepted Answer

Capacitor

Answer

A capacitor stores energy in an electric field between its plates, expressed as E = ½CV².

Question 5

What is the frequency of standard US household AC power?

Accepted Answer

60 Hz

Answer

Standard US household AC power operates at 60 Hz, completing 60 cycles per second.

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