Mechanical Aptitude Mechanical Aptitude Basic Electrical Circuits 3

Question 1

An electric motor draws 5 amps from a 240V supply. How much power does it consume?

Accepted Answer

1,200 watts

Answer

Power = Voltage × Current = 240V × 5A = 1,200 watts.

Question 2

What happens to the total resistance in a series circuit when an additional resistor is added?

Accepted Answer

Total resistance increases

Answer

In a series circuit, resistances add together directly, so adding any resistor always increases total resistance.

Question 3

Which of the following is a good conductor of electricity?

Accepted Answer

Copper

Answer

Copper has very low electrical resistance due to its free electrons, making it an excellent conductor widely used in wiring.

Question 4

In a series circuit with a 12V battery and three identical 4-ohm resistors, what is the voltage across each resistor?

Accepted Answer

4 volts

Answer

Total resistance = 12 ohms, current = 12V/12Ω = 1A; voltage across each resistor = 1A × 4Ω = 4 volts.

Question 5

What is the term for the opposition to the flow of electric current in a conductor?

Accepted Answer

Resistance

Answer

Resistance, measured in ohms, is the opposition that a material or component presents to current flow.

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