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Question:

Which of the following is NOT a unit of power?

A None of the answers is correct.

explanation

Power is the rate of doing work i.e. Power = Work/time = J/s. Electrical power is described as P = VI and the unit of power is Watt (W). Power is the product of current and voltage, so it can also be written as V.A where V represents the voltage and A represents the current.

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A ground is NOT which of the following?

A place with a maximum resistance.

A ground is also called the earth in an electrical circuit. A ground is a place of lowest potential and least resistance in an electrical circuit. Ground/Earth is also a reference point in an electrical circuit from which voltages are measured and a common reference path for electric current.

A capacitor blocks Direct Current (D.C). Hence, it is also known as a ____.

Both Blocking and Coupling Capacitors

A blocking capacitor is also called the coupling capacitor. It is used to block the passage of flow of direct current (D.C) from one circuit to another by giving alternative passage to flow.

A circuit breaker is better than a fuse because ____.

A circuit breaker can be reused multiple times.

A circuit breaker is better than a fuse because it can be reused multiple times unlike a fuse which needs to be replaced once it is blown.

If three different resistors are connected in parallel and a voltage is applied across them, which of the following statements is correct?

The greatest resistance has the least power loss across three resistances.

If three different resistances are connected in parallel and a voltage is applied across them then the voltage is same across all the resistances. The formula for finding power is \(P=VI= V\frac{\mathrm{V} }{\mathrm{R} } = \frac{\mathrm{ V^2 } }{\mathrm{R} }\). According to the formula, the resistor with the least value will have the maximum power loss and the resistor with the maximum value will have the least power loss.

Which of the following statements is INCORRECT regarding Ohm's Law?

Voltage is inversely proportional to the current.

Ohm's law states that V = IR. According to the law, voltage is directly proportional to both current and resistance while current is inversely proportional to the resistance.

Which of the following is the most conductive element?

Silver

The most conductive material is Silver followed by Copper and Gold.