the component in the upper branch is an ideal 2.9 A fuse. It has zero resistance
ID: 2258907 • Letter: T
Question
the component in the upper branch is an ideal 2.9 A fuse. It has zero resistance as long as the current through it remains less than 2.9 A. If the current reaches 2.9 A it 'blows' and thereafter has infinite resistance. Switch S is closed at time t = 0 . Use the numerical values : E=12 V, L=5.7 H.
When does the fuse blow ?
s
the component in the upper branch is an ideal 2.9 A fuse. It has zero resistance as long as the current through it remains less than 2.9 A. If the current reaches 2.9 A it 'blows' and thereafter has infinite resistance. Switch S is closed at time t = 0 . Use the numerical values : E=12 V, L=5.7 H. When does the fuse blow ?Explanation / Answer
Since the resistor is in parallel with the fuse which is 0 ohms, we can ignore the resistor.
V= L*di/dt in a purely inductive circuit.
Rearrange to Time = Current*Inductance/Voltage
t = IL/V =2.9*5.7/12 =1.3775 seconds or approx 1.38 seconds
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