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Circuits Jeopardy
Symbol and
Units of…
Current, Voltage
Resistance/
Resistivity
Conservation of
Current
Who is missing?
10
10
10
10
10
20
20
20
20
20
30
30
30
30
30
40
40
40
40
40
50
50
50
50
50
Electric Current
Symbol: I
Units: Amperes (A)
Potential difference
Symbol: V
Units: Volts (V)
Electric Charge
Symbol: q
Units: Coulombs (C)
Work
Symbol: W
Units: J
Charge divided by time
Amperes
If 100 coulombs of charge pass
through a wire in 5 seconds, what
is the current?
20 Amperes
If 50 joules of work is done on 5.5
coulombs of charge, what is the
potential drop?
9.1
What is the charge that moves
through a wire with a current of 10
amperes in 10 seconds?
100 C
What is the potential
difference applied on a 25 ohm
resistor with a current of 10
amperes?
250 V
What is the potential difference felt by
a device that moves 30 coulombs of
electric charge every 3 seconds across
a 5 ohm resistor?
50 Volts
What is the resistance in a wire that
has length of 2 meters, crosssectional area of 5 meter squared
and a resistivity of silver?
6.39 x 10^-9 ohms
If I wanted to change one of these factors
about a copper wire, which of the
following will provide the strongest
resistance?
a. Doubling the area of the wire
b. Doubling the length of the wire
c. Doubling both the length and area of the wire
d. None of the above
B.
• If I have a wire with a resistance of 10 ohms, a
resistivity of 5 ohm meters and a cross-sectional
area of 3 meters squared, then what is the length of
my wire?
6 meters
Say we had wires of the same length and
cross-sectional area for each of the
materials in the table below. Which one
would produce the least resistance in a
circuit?
Silver
What is cross-sectional area of a wire who
has a length of 0.02 meters, a resistivity of
1.72 x 10-8 ohm meters, and a resistance of
40 ohms?
8.6 x 10-12 meters squared
What is the law of conservation of
current?
Current going in = current going out
• The diagram below represents currents in
branches of a circuit. What should be the
reading in ammeter A?
8A
6A
P
A
14 amperes
• The diagram below represents currents in branches
of a circuit. What should be the reading in ammeter
A?
5A
5A
P
2A
A
8A
• Which diagram represents the correct current
direction in a segment of an electric circuit
4A
a)
4A
b)
2A
2A
2A
4A
c)
2A
2A
4A
d)
2A
D
2A
2A
• What is the reading in ammeter A
4A
6A
A
5A
5A
Maggie
Brian
Buster Bunny
Spunky
Dill Pickles