# Question- Task 3.3 = (a) The winding of an electromagnet has an inductance of 3H and a resistance of 15Ω. When it is connected to a 120V, d.c. supply, calculate: (i) the steady state value of current flowing in the winding, (ii) the time constant of the …

**Free complete solution to this question: " Growth and decay of current in lr circuit"**

Solve problems involving current growth/decay in an L-R circuit and voltage growth/decay in a C-R circuit.

(a) The winding of an electromagnet has an inductance of 3H and a resistance of 15Ω. When it is connected to a 120V, d.c. supply, calculate:

(i) the steady state value of current flowing in the winding,

(ii) the time constant of the circuit,

(iii) the value of the current after 0.3 s

(b) A 15μF uncharged capacitor is connected in series with a 47 kΩ resistor across a 120 V, d.c. supply. Plot the ** capacitor voltage growth characteristics** by preparing a table of data . From the graph,

determine the capacitor voltage at a time equal to one time constant after being connected to the supply. Also, find the time for the capacitor voltage to reach its final steady state value.

Task 3.3 (P3.3) (@) The winding of an electromagnet has an inductance of 3H and a resistance of 150. When it is connected to a 120V, .Â¢, supply, calculate: (i the steady state value of current flowing in the winding, (i the time constant of the circuit, (ii) the value of the current after 0.3 s (b) A 15uF uncharged capacitor is connected in series with a 47 kQ. resistor across a 120 V. d.c, supply. Plot the capacitor voltage growth characteristics by preparing a table of data, From the graph, determine the capacitor voltage at a time equal to one time constant after being connected to the supply Also, find the time for the capacitor voltage to reach its final steady state value

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