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Ohm's Law
Class:
Name:
1.
__________
Date:
In the circuit shown, what is the current
through the resistor?
3.
(1) 0.50 ampere
(2) 2.0 amperes
(3) 0.25 ampere
What is the current through a 25-ohm
resistor connected to a 5.0-volt power
supply?
(1) 0.20 ampere
(2) 5.0 amperes
(3) 25 amperes
(4) 30 amperes
(4) 4.0 amperes
2.
4.
In the circuits represented, the symbol
and the symbol
for an ammeter is
for a voltmeter is
. Which diagram
represents the proper connections for
determining the resistance of a circuit?
(1)
The resistance of a wire is determined
by the voltmeter-ammeter method. If the
voltmeter reads 10 volts and the ammeter
reads 2.0 amperes, the resistance is
(1) 20 ohms
(2) 5.0 ohms
(3) 2.5 ohms
(4) 0.20 ohm
(2)
5.
(3)
When the total resistance of a simple
electrical circuit is decreased while
keeping the voltage constant, the current
in the electrical circuit will
(1) decrease
(2) increase
(4)
(3) remain the same
page 1
6.
Shown is a circuit diagram of a 120-volt
power source running a heater that draws
10.0 amperes of current.
9.
Which graph represents a circuit element
at constant temperature that obeys Ohm's
law?
(1)
(2)
(3)
(4)
The resistance of the heater has a value
of
7.
(1) 0.083 ohm
(2) 12 ohms
(3) 130 ohms
(4) 1,200 ohms
If the potential di erences across a
12-ohm resistor is 4 volts, the current
through the resistor is
(1)
1
3
A
(3) 3 A
8.
(2)
1
2
A
(4) 4 A
10.
A student in the electricity lab plotted
the graph shown of current I established
in a particular circuit as a function of the
voltage V applied to the circuit. Which
mathematical relationship most probably
exists between the current and voltage?
(1) direct linear
(2) direct square
(3) inverse
(4) inverse square
Class: __________
page 2
Which diagram shows the correct current
direction in a circuit segment?
(1)
(2)
(3)
(4)
Ohm's Law
11.
The graph here shows the relationship
between current and potential di erence
for four resistors, A, B, C, and D. Which
resistor has the greatest resistance?
13.
Compared to an insulator, a conductor of
electric current has
(1) more free electrons per unit volume
(2) fewer free electrons per unit volume
(3) more free atoms per unit volume
(4) fewer free atoms per unit volume
(1) A
(2) B
(3) C
(4) D
14.
The diagram shows the current in a
segment of a direct current circuit. What
is the reading of ammeter A ?
(1) 1 A
12.
(2) 5 A
The diagram here shows the current in
three of the branches of a direct current
electric circuit. The current in the fourth
branch, between junction P and point W,
must be
(3) 7 A
(4) 8 A
15.
The diagram shows currents in a segment
of an electric circuit
What is the reading of ammeter A ?
(1) 1 A toward point W
(1) 8 A
(2) 1 A toward point P
(2) 2 A
(3) 7 A toward point W
(3) 3 A
(4) 7 A toward point P
Class: __________
(4) 13 A
page 3
Ohm's Law
16.
A student uses a voltmeter to measure
the potential di erence across a circuit
resistor. To obtain a correct reading, the
student must connect the voltmeter
18.
The accompanying graph represents
the relationship between the potential
di erence across a metal conductor and
the current through the conductor at a
constant temperature.
(1) in parallel with the circuit resistor
(2) in series with the circuit resistor
(3) before connecting the other circuit
components
(4) after connecting the other circuit
components
What is the resistance of the conductor?
17.
19.
What is the potential di erence across a
2.0-ohm resistor that draws 2.0 coulombs
of charge per second?
(1) 1.0 V
(2) 2.0 V
(3) 3.0 V
(4) 4.0 V
(1) 1
(2) 0.01
(3) 0.1
(4) 10
A simple electrical circuit contains a
battery, a light bulb, and a properly
connected ammeter. The ammeter has a
very low internal resistance because it is
connected in
(1) parallel with the bulb to have little
e ect on the current through the
bulb
(2) parallel with the bulb to prevent
current ow through the bulb
(3) series with the bulb to have little
e ect on the current through the
bulb
(4) series with the bulb to prevent
current ow through the bulb
Class: __________
page 4
Ohm's Law
20.
A resistor was held at constant temperature in an operating electric circuit. A student measured
the current through the resistor and the potential di erence across it. The measurements are
shown in the data table.
Data Table
Current (A)
0.010
Potential
Di erence (V)
2.3
0.030
7.4
0.020
0.040
0.050
5.2
9.9
12.7
a) Using the information in the data table, construct a graph a grid, following the directions
shown.
1) Mark an appropriate scale on the axis labeled “Current (A).”
2) Plot the data points for potential di erence versus current.
3) Draw the best- t line.
b) Using your graph, nd the slope of the best- t line. [Show all calculations, including the
equation and substitution with units.]
c) What physical quantity does the slope of the graph represent?
Class: __________
page 5
Ohm's Law
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Class: __________
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Ohm's Law
06/27/2013