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Physics 8B
10 – AC Circuits
rev 4.0
10 – AC Circuits
1.
Consider the RC circuit shown, powered by
a 398Hz, 12V r.m.s source.
a)
Q:
If graph A below represents the variation with time of current in the 30
Ω
resistor, which graph A, B, C or D,
BEST
represents the variation with time of:
i)
The potential difference across the 30
Ω
resistor? Explain.
ii)
The current in the 10
µ
F capacitor? Explain.
iii)
The potential difference across the 10
µ
F capacitor? Explain.
b)
P:
What is the capacitive reactance of the 10
µ
F capacitor?
c)
P:
What is the total impedance of the circuit?
d)
P:
What is the r.m.s current in the circuit?
e)
P:
What is the r.m.s potential difference across:
i)
The 30
Ω
resistor?
ii)
The 10
µ
F capacitor?
f)
Q:
Why do your answers in part e) not add up to the output voltage of the source
of 12V?
30
Ω
10
μ
F
12V, 398Hz
A
B
C
D
t
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View Full DocumentPhysics 8B
10 – AC Circuits
rev 4.0
2.
Consider the RL circuit below. Assume the
inductor has a negligible resistance. The circuit
is driven by a signal generator with an output of
868Hz, 2.6V r.m.s.
a)
Q:
If graph A below represents the variation with time of current in the 50
Ω
resistor, which graph A, B, C or D,
BEST
represents the variation with time of:
i)
The potential difference across the 50
Ω
resistor? Explain.
ii)
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 Spring '07
 SHAPIRO
 Physics, Current, Power

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