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AP Physics Daily Problem #121
A battery having a potential difference of 12V is attached
to this parallel circuit
Find the net resistance of the two resistors.
+
50Ω
30Ω
12V
Find the current drawn from the battery.
Find the current through the 50Ω resistor.
Find the current through the 30Ω resistor.
A battery having a potential difference of 12V is attached
to this series circuit.
Find the net resistance of the two resistors.
+
50Ω
12V
30Ω
Find the current drawn from the battery.
Find the current through the 50Ω resistor.
Find the current through the 30Ω resistor
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AP Physics Daily Problem #122
Label each resistor in the circuit below with its voltage drop, current, and power used.
Calculate the current and power drawn from the battery. At the bottom of this page, list
the steps you used in solving this problem, including the law (loop rule, junctions rule,
Ohm’s law) used.
50Ω
30Ω
20Ω
+
120V
Steps used in solving circuit:
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AP Physics Daily Problem #123
(1984 #3)
A heating coil is placed in a thermally isolated tank of negligible heat capacity. The tank
contains 0.1kg of water and 0.01kg of ice, both initially at a temperature of 0C. The
resistance of the coil is 25Ω, independent of temperature and there is a current of 2.0A in
the coil. Calculate each of the following quantities:
(a) The heat transferred to the water and ice in time t.
(b) The time t1 necessary to melt all the ice (the latent heat of fusion of ice is
3.34x105joules per kilogram.)
(c) The additional time t2 necessary to bring the water to a boil (the specific heat of
water is 4.19x103 Joules per kilogram • Kelvin.)
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AP Physics Daily Problem #124
The circuit below has a battery with an internal resistance of 1.0Ω.
5.0Ω
3.0Ω
2.0Ω
+
12V
What is the overall resistance of the circuit (including the battery’s internal resistance)
How much current is drawn from the battery?
How much power is drawn from the battery?
What is the current through the 5.0Ω and 3.0Ω resistors?
What is the total power dissipated by the three resistors?
Why is the amount of power dissipated by the three resistors different from the amount of
power produced by the battery?
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AP Physics Daily Problem #125
The battery in this circuit has no internal resistance.
R1
2.0Ω
+
R2
R3
12V
What is the overall resistance of the circuit?
Find the voltage drop of R3.
Find the resistance of R3.
Find the current through R1.
Find the current through R2
Find the resistance of R2.
4.0V
3.5A
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AP Physics Daily Problem #126
The battery in this circuit has an internal resistance of 2Ω.
R1
R5
12V
3.0A
R2
2.0V
2.0A
R6
R3
R4
12Ω
+
R7
5.0A
8.0V
48V
Make a table showing the resistance, current, and voltage drop for each resistor. Be sure
to include the internal resistance in your table!
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AP Physics Daily Problem #127
20F
10F
50F
+
10V
What is the net capacitance of the 10F and 50F capacitors in parallel?
What is the net capacitance of the complete circuit?
How much charge is stored in the circuit?
How much charge is stored in the 20F capacitor?
What is the voltage drop across the 20F capacitor?
What is the voltage drop across the 10F capacitor?
How much charge is stored in the 10F capacitor?
How much charge is stored in the 50F capacitor?
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AP Physics Daily Problem #128 (1995 #2)
A certain light bulb is designed to dissipate 6 watts when it is connected to a 12V source.
(a) Calculate the resistance of the light bulb
(b) If the light bulb functions as designed and is continuously lit for 30 days, how much
energy is used? Be sure to indicate the units in your answer.
The 6-watt, 12-volt bulb is connected in a circuit with a 1500-watt 120-volt toaster, an
adjustable resistor, and a 120-volt power supply. The circuit is designed such that the
bulb and the toaster operate at the given values and, if the light bulb fails, the toaster will
still function at these values.
(c) On the diagram below, draw in wires connecting the components shown to make a
complete circuit that will function as described above.
120-Volt
Supply
12-Volt
Bulb
Adjustable
Resistor
120-Volt
Toaster
(d) Determine the value of the adjustable resistor that must be used in order for the circuit
to work as designed.
(e) If the resistance of the adjustable resistor is increased, what will happen to the
following?
The brightness of the bulb. Briefly explain your reasoning
The power dissipated by the toaster. Briefly explain your reasoning
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AP Physics Daily Problem #129
Read Chapter 20 (Giancoli) or chapter 19 (Hecht) before doing this problem!
A power line carrying 1000A of current is suspended 30m above ground level. The
current is flowing from south to north.
Determine the direction and magnitude of the magnetic field at ground level.
An electric fence wire is located directly underneath and parallel to the power line. A
10A current flows through the wire northward. Determine the magnitude and direction of
the force on 100m of this wire due to the magnetic field of the power line.
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AP Physics Daily Problem #130
A 1g particle containing 50C is fired at 100m/s southward into an upwardly directed
magnetic field of 5.0T
Determine the force exerted on the particle (magnitude and direction)
Determine the acceleration of the particle (magnitude and direction)
Describe the path of the particle as it remains in the field. You may find a diagram to be
helpful in your description