A circuit consists of three identical lamps connected to a battery as in Figure OQ28.14. The battery has some internal resistance. The switch S, originally open, is closed. (i) What then happens to the brightness of lamp B? (a) It increases. (b) It decreases somewhat. (c) It does not change. (d) It drops to zero. For parts (ii) to (vi), choose from the same possibilities (a) through (d). (ii) What happens to the brightness of lamp C? (iii) What happens to the current in the battery? (iv) What happens to the potential difference across lamp A? (v) What happens to the potential difference across lamp C ? (vi) What happens to the total power delivered to the lamps by the battery?
A circuit consists of three identical lamps connected to a battery as in Figure OQ28.14. The battery has some internal resistance. The switch S, originally open, is closed. (i) What then happens to the brightness of lamp B? (a) It increases. (b) It decreases somewhat. (c) It does not change. (d) It drops to zero. For parts (ii) to (vi), choose from the same possibilities (a) through (d). (ii) What happens to the brightness of lamp C? (iii) What happens to the current in the battery? (iv) What happens to the potential difference across lamp A? (v) What happens to the potential difference across lamp C ? (vi) What happens to the total power delivered to the lamps by the battery?
Solution Summary: The author explains that when the switch is opened, the current is completing its path by flowing through lamp A, Lamp B, and Lamp C.
A circuit consists of three identical lamps connected to a battery as in Figure OQ28.14. The battery has some internal resistance. The switch S, originally open, is closed. (i) What then happens to the brightness of lamp B? (a) It increases. (b) It decreases somewhat. (c) It does not change. (d) It drops to zero. For parts (ii) to (vi), choose from the same possibilities (a) through (d). (ii) What happens to the brightness of lamp C? (iii) What happens to the current in the battery? (iv) What happens to the potential difference across lamp A? (v) What happens to the potential difference across lamp C? (vi) What happens to the total power delivered to the lamps by the battery?
25.54. In the circuit shown in
Fig. P25.54, R is a variable resistor whose
value ranges from 0 to co, and a and b are
the terminals of a battery that has an emf
E = 15.0V and an internal resistance of
4.00 2. The ammeter and voltmeter are
idealized meters. As R varies over its full
range of values, what will be the largest
and smallest readings of (a) the voltmeter
and (b) the ammeter? (c) Sketch qualita-
tive graphs of the readings of both meters
as functions of R.
Figure P25.54
R
25.33
The circuit shown Figure E25.33
in Fig. E25.33 contains two
batteries, each with an emf and
an internal resistance, and two
resistors. Find (a) the current in 5.0 N
the circuit (magnitude and di-
rection) and (b) theterminal volt-
1.6 Ω 16.0V
ww
b.
a
90 Ω
1.4 N 8.0V
ww
age Vab of the 16.0-V battery.
You have a battery with a voltage of Vtotal = 25 V and two resistors, both with a resistance of R, = R,
%3D
40 0.
a. How can you connect the resistors to the battery (in series or parallel) in order to achieve the
largest power dissipation? How much power is dissipated in this case?
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