RLC circuits

Which of the following correctly represent Ohm's Law

• I=V/R

• V=I/R

• R=VI

• I=R/V

Which statement correctly state Ohm's Law?

• The current in a circuit is proportional to the resistance

• The current in a circuit is directly proportional to applied voltage

• The voltage in a circuit in inversely proportional to the resistance

• The applied voltage is inversely proportional to the current in the circiut

Answer explanation

The term directly proportional means that the relationship is linear ( meaning if the applied voltage is changed to 2 times the original value, the new current will also be increased by 2 times)

If the voltage in a circuit of constant load is increased by 3 times, the current will

• remain the same

• increased by 3 times

• reduced by 3 times

• reduced by 9 times

When the applied voltage is kept constant ,as the the resistance of the given circuit increases , the current

• increases

• reduces

• remains

• fluctuates

Which of the following is correct about inductive cicruit?

• current leads the voltage

• voltage lags the current

• current lags the voltage

• current and voltage are in phase

In the diagram shown on the left , the current

• leads the voltage

• lags the voltage

• is in phase with the voltage

• is out of phase with voltage

The picture shown on the left is know as a

• phaser diagram for resistive load

• phaser diagram for inductive laod

• phaser diagram for capacitive laod

• phaser diagram for constant load

In Fig 2 the phaser diagram represent the relationship between current and voltage of a/an

• capacitive load

• resistive load

• inductive load

• constant load

In the diagram on the left , the letter "L" means inductor and the unit for the inductance is

• Ohm

• Henry

• Ampere

• Farad

In the circuit given , if the Inductance is 30 mH and the supply frequency is 50 Hz, find the inductive reactance of the circuit.

(XL =2πfL)

• 9.42 Ω

• 94.2 Ω

• 942 Ω

• 0.942 Ω