Current and power

Question

Answer 1

(1)

Step 1 :

Circuit current is .

Find the voltage using waveform given.

Observe the graph:

Two points in the interval are and .

Two points in the interval are and .

Find the voltage in .

Slope =

Point slope form of the equation is .

Slope = 20 and the point is .

Voltage in is .

Step 2 :

Similarly for .

Slope = .

Slope = -20 and the point is .

Voltage in is .

Find the circuit current : .

Resistance .

Circuit current in :

Circuit current in :

Therefore the circuit current is

in .

in .

Solution :

Answer 2

(2)

Step 1 :

Current where  .

Power .

Substitute  and in the above equation.

where .

Step 2 :

Current where  .

Substitute  and in the above equation.

where .

Solution :