Unit 1

Which of the following is the correct expression for Ohm’s Law?

• V=I+R

• I=V/R​

• V=IR

• R=V−I

Which component in a circuit opposes the flow of current and converts electrical energy into heat?

• Resistor
  

• Capacitor

• Inductor

• Conductor

In Kirchhoff's Current Law (KCL), the sum of currents at any node is:

• Zero

• Equal to the voltage

• Equal to the resistance

• Equal to the power

What does the inductance of an inductor depend on?

• The length of the wire

• The number of coils

• The type of material used

• All of the above

The RMS value of a sinusoidal AC current is equal to:

• The average current value

• The peak current value divided by √2

• The average of the square of the instantaneous current

• The peak current value multiplied by √2

What is the main difference between active power (P) and apparent power (S) in an AC circuit?

• Active power is the total power supplied, while apparent power is the power consumed.

• Active power is the real power consumed, while apparent power is the total power supplied.

• Active power is consumed by inductive elements, while apparent power is consumed by resistive elements.

• Active power is never equal to apparent power.

In a purely resistive AC circuit, the phase difference between voltage and current is:

• 90°

• 180°

• 0°

• 45°

Which of the following is true for the average value of a sinusoidal AC voltage?

• The average value is equal to the peak value.

• The average value over a full cycle is zero.

• The average value is always positive.

• The average value is twice the RMS value.