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Camden 20.4-20.5 Review
Test Description: Its myf irst test
Instructions: Answer all questions to get your test result.
1) What is Ohm's Law?
A
Resistance is equal to the current divided by the voltage. (R= I/V)
B
Voltage is equal to the resistance divided by the current. (V= R/I)
C
Current is equal to the voltage divided by the resistance. (I= V/R)
D
Resistance is equal to the voltage divided by the current. (R= V/I)
2) What is electric power?
A
The rate at which students do laps with Avery's crutches
B
The rate at which electrical energy is converted to another form of energy.
C
The rate at which electrical energy is loses energy.
D
The rate at which electrical energy is converted to another form of friction.
3) How do you calculate electrical energy?
A
P=Et (power is in kW and time is in hours)
B
E=Pt (power is in kW and time is in hours)
C
t=PE (power is in kW and time is in hours)
D
E=P/t (power is in kW and time is in hours)
4) The variable V in a formula is what?
A
Term = Voltage, Unit Name = Volts, Unit symbol = W
B
Term = Voltage, Unit Name = Volts, Unit symbol = Ω
C
Term = Voltage, Unit Name = Volts, Unit symbol = A
D
Term = Voltage, Unit Name = Volts, Unit symbol = V
5) The variable I in a formula is what?
A
Term = Current, Unit Name = Resistance, Unit symbol = R
B
Term = Current, Unit Name = Amps, Unit symbol = Ω
C
Term = Current, Unit Name = Amps, Unit symbol = A
D
Term = Current, Unit Name = Amps, Unit symbol = I
6) The variable R in a formula is what?
A
Term = Resistance, Unit Name = Ohms, Unit symbol = R
B
Term = Resistance, Unit Name = Watts, Unit symbol = R
C
Term = Resistance, Unit Name = Ohms, Unit symbol = Ω
D
Term = Resistance, Unit Name = Watts, Unit symbol = Ω
7) The variable P in a formula is what?
A
Term = Power, Unit Name = Kilowatt Hours, Unit symbol = kWh
B
Term = Power, Unit Name = Watts, Unit symbol = W
C
Term = Power, Unit Name = Watts, Unit symbol = P
D
Term = Power, Unit Name = Kilowatt Hours, Unit symbol = W
8) The variable E in a formula is what?
A
Term = Energy, Unit Name = Kilowatt Hours, Unit symbol = kWh
B
Term = Energy, Unit Name = Watt Hours, Unit symbol = kWh
C
Term = Energy, Unit Name = Watt Hours, Unit symbol = Wh
D
Term = Energy, Unit Name = Kilowatt Hours, Unit symbol = E
9) Compare and contrast series and parallel circuits?
A
Parallel circuit has only 1 path for current to take, series has several paths.
B
Series circuit has only 1 path for current to take, parallel has several paths.
C
Parallel circuit has 2 paths for current to take, series has several paths.
D
Series circuit has 2 paths for current to take, parallel has several paths.
10) Compare and contrast series and parallel circuits?
A
Parallel circuit is open the entire circuit goes out. If a branch of a series circuit is open, only that branch goes out
B
Parallel circuit is open half the circuit goes out. If a branch of a series circuit is open, only that branch goes out
C
series circuit is open half the circuit goes out. If a branch of a parallel circuit is open, only that branch goes out
D
series circuit is open the entire circuit goes out. If a branch of a parallel circuit is open, only that branch goes out
11) A series circuit has 3 bulbs in it. a) What happens to the rest of the circuit if one of the bulbs is removed? Why?
A
No bulbs go out because the flow of the current is not interrupted
B
None of the other bulbs go out because the current keeps flowing
C
Nothing will happen to the other bulbs since in a series circuit each branch operates independently.
D
All bulbs go out because there is only 1 path for current to flow.
12) A series circuit has 3 bulbs in it. What happens to the brightness of the other bulbs if an additional bulb is added? Why?
A
brightness of all bulbs will dim bc adding another bulb increases the overall resistance/reduces current I=R/V
B
brightness of all bulbs will dim bc adding another bulb increases the overall resistance/reduces current R=V/I
C
brightness of all bulbs will dim bc adding another bulb increases the overall resistance/reduces current I=V/R
D
Nothing will happen to the other bulbs since in a series circuit each branch operates independently.
13) A parallel circuit has 3 branches each with 1 bulb. a) What happens to the other bulbs if one of the bulbs is removed? Why?
A
None of the other bulbs will go out since in a parallel circuit each branch is dependent on the others
B
All bulbs go out because there is only 1 path for current to flow.
C
Nothing will happen to the other bulbs since in a parallel circuit each branch operates independently.
D
All the other bulbs will go out since in a parallel circuit each branch is dependent on the others
14) A parallel circuit has 3 branches each with 1 bulb. What happens to the brightness of the other bulbs if another bulb is added to a new branch? Why?
A
The other bulbs will since in a parallel circuit each branch operates independently.
B
The other bulbs will since in a parallel circuit each branch operates dependently on the others
C
Nothing will happen to the other bulbs since in a parallel circuit each branch operates independently.
D
brightness of all bulbs will dim bc adding another bulb increases the overall resistance/reduces current I=V/R
15) What is the current that flow through a 350Ω light bulb if it is connected to a 120V source? I = ? R= 350Ω V=120V
A
I =V/R = 120/35 0= 0.342 A
B
I =V/R = 35/120 0= 0.291 A
C
I =R/V = 35/120 0= 0.342 A
D
I =R/V = 35/120 0= 0.291 A
16) What is the power rating of a heater if 8.5A of current flow through it when plugged into a wall socket that operates at a voltage of 240V? P = ? I = 8.5A V = 240V
A
P = IV = 8.5x240 = 2040 W
B
P=V/I 240/8.5 = 28.235 W
C
P=I/V 8.5/240 = 0.035 W
D
P = IV = 8.5x2040 = 204 W
17) A) How much energy is used by a 1100W air conditioner that is on for 45 minutes? E = ? P=1100W = 1.1kW (must convert to KW for energy) t = 45 minutes = .75h
A
E = P/t = 1.1kW / .75h =1.467 kWh
B
E = t/P = .75h/1.1kW = 0.682 kWh
C
E = IV = 1.1kW x .75h = 0.825 kWh
D
E = Pt = 1.1kW x .75h = 0.825 kWh
18) B) What is the cost of this energy if electricity costs $0.08 per kWh? kWh=.825
A
Cost = 0.825 x .08 = $0.066
B
Cost = 0.825 / 0.08 = $0.066
C
Cost = 0.825 x .08 = $0.099
D
Cost = 0.825 / 0.08 = $10.312
19) What is the formula for power?
A
P=V/I
B
P=I/V
C
P=IR
D
P = IV
20) What is the formula for energy?
A
E = P/t
B
E = PI
C
E = Pt
D
E = t/P
*select an answer for all questions
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