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# Test: AC Applied Across Resistor

## 10 Questions MCQ Test Physics Class 12 | Test: AC Applied Across Resistor

Description
This mock test of Test: AC Applied Across Resistor for Class 12 helps you for every Class 12 entrance exam. This contains 10 Multiple Choice Questions for Class 12 Test: AC Applied Across Resistor (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: AC Applied Across Resistor quiz give you a good mix of easy questions and tough questions. Class 12 students definitely take this Test: AC Applied Across Resistor exercise for a better result in the exam. You can find other Test: AC Applied Across Resistor extra questions, long questions & short questions for Class 12 on EduRev as well by searching above.
QUESTION: 1

### Virtual value or effective value of a.c. is​

Solution:

Solution :- as we know that H= (I0R)/2 * T/2 -----------------------(1)

If I(rms) be the rms value of ac then

H = I2(rms)R T/2 ---------------------(2)

From eq (1)&(2)

I2(rms)R T/2 = (I02R)/2 * T/2

I2(rms) = (I02)/2

= I(rms)= (I0)/(2)½

= I(rms) = 0.707 I0

QUESTION: 2

Solution:
QUESTION: 3

### What is time constant

Solution:
QUESTION: 4

Find the instantaneous voltage for an a.c. supply of 200V and 75 hertz​

Solution:

Solution :-  f = 75hz

w=2πf

= 2 * π * 75

= 150π

E(max) = (2)^½ E(rms)

E(max) = 1.414 * 200

= 282.8V

E(ins) = E(max)sinwt

E(ins) = 282.8 sin 150πt

QUESTION: 5

If a capacitor of capacitance 9.2F has a voltage of 22.5V across it. Calculate the energy of the capacitor.

Solution:
QUESTION: 6

Alternating current is represented by

Solution:

Alternating current is an electric current which periodically reverses direction, as opposed to direct current which flows only in one direction. And it can be easily represented by the periodic function.
So, I = Io sin wt or I = lo cos wt.

QUESTION: 7

What is the relationship between Em and E0

Solution:
QUESTION: 8

The only component that dissipates energy in ac circuit is:

Solution:
QUESTION: 9

Which is more dangerous?​

Solution:
QUESTION: 10

The average power dissipation in pure resistive circuit is:

Solution: