Camden 20.4-20.5 Review Question Preview (ID: 40452)
Its Myf Irst Test.
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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 = Pt = 1.1kW x .75h = 0.825 kWh
b) E = P/t = 1.1kW / .75h =1.467 kWh
c) E = t/P = .75h/1.1kW = 0.682 kWh
d) E = IV = 1.1kW x .75h = 0.825 kWh
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
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 =R/V = 35/120 0= 0.342 A
c) I =R/V = 35/120 0= 0.291 A
d) I =V/R = 35/120 0= 0.291 A
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=I/V 8.5/240 = 0.035 W
c) P=V/I 240/8.5 = 28.235 W
d) P = IV = 8.5x2040 = 204 W
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) Nothing will happen to the other bulbs since in a parallel circuit each branch operates independently.
b) brightness of all bulbs will dim bc adding another bulb increases the overall resistance/reduces current I=V/R
c) The other bulbs will since in a parallel circuit each branch operates independently.
d) The other bulbs will since in a parallel circuit each branch operates dependently on the others
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) Nothing will happen to the other bulbs since in a parallel circuit each branch operates independently.
b) All bulbs go out because there is only 1 path for current to flow.
c) All the other bulbs will go out since in a parallel circuit each branch is dependent on the others
d) None of the other bulbs will go out since in a parallel circuit each branch is dependent on the others
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=V/R
b) brightness of all bulbs will dim bc adding another bulb increases the overall resistance/reduces current I=R/V
c) brightness of all bulbs will dim bc adding another bulb increases the overall resistance/reduces current R=V/I
d) Nothing will happen to the other bulbs since in a series circuit each branch operates independently.
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) All bulbs go out because there is only 1 path for current to flow.
b) Nothing will happen to the other bulbs since in a series circuit each branch operates independently.
c) None of the other bulbs go out because the current keeps flowing
d) No bulbs go out because the flow of the current is not interrupted
The variable P in a formula is what?
a) Term = Power, Unit Name = Watts, Unit symbol = W
b) Term = Power, Unit Name = Watts, Unit symbol = P
c) Term = Power, Unit Name = Kilowatt Hours, Unit symbol = kWh
d) Term = Power, Unit Name = Kilowatt Hours, Unit symbol = W
The variable E in a formula is what?
a) Term = Energy, Unit Name = Kilowatt Hours, Unit symbol = kWh
b) Term = Energy, Unit Name = Kilowatt Hours, Unit symbol = E
c) Term = Energy, Unit Name = Watt Hours, Unit symbol = Wh
d) Term = Energy, Unit Name = Watt Hours, Unit symbol = kWh
Compare and contrast series and parallel circuits?
a) Series circuit has only 1 path for current to take, parallel has several paths.
b) Parallel circuit has only 1 path for current to take, series has several paths.
c) Series circuit has 2 paths for current to take, parallel has several paths.
d) Parallel circuit has 2 paths for current to take, series has several paths.
Compare and contrast series and parallel circuits?
a) series circuit is open the entire circuit goes out. If a branch of a parallel circuit is open, only that branch goes out
b) Parallel circuit is open the entire 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) Parallel circuit is open half the circuit goes out. If a branch of a series circuit is open, only that branch goes out
The variable I in a formula is what?
a) Term = Current, Unit Name = Amps, Unit symbol = A
b) Term = Current, Unit Name = Amps, Unit symbol = Ω
c) Term = Current, Unit Name = Resistance, Unit symbol = R
d) Term = Current, Unit Name = Amps, Unit symbol = I
The variable R in a formula is what?
a) Term = Resistance, Unit Name = Ohms, Unit symbol = Ω
b) Term = Resistance, Unit Name = Ohms, Unit symbol = R
c) Term = Resistance, Unit Name = Watts, Unit symbol = Ω
d) Term = Resistance, Unit Name = Watts, Unit symbol = R
The variable V in a formula is what?
a) Term = Voltage, Unit Name = Volts, Unit symbol = V
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 = W
How do you calculate electrical energy?
a) E=Pt (power is in kW and time is in hours)
b) P=Et (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)
What is electric power?
a) The rate at which electrical energy is converted to another form of energy.
b) The rate at which electrical energy is loses energy.
c) The rate at which electrical energy is converted to another form of friction.
d) The rate at which students do laps with Avery's crutches
What is Ohm's Law?
a) Resistance is equal to the voltage divided by the current. (R= V/I)
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 current divided by the voltage. (R= I/V)
What is the formula for power?
a) P = IV
b) P=I/V
c) P=V/I
d) P=IR
What is the formula for energy?
a) E = Pt
b) E = P/t
c) E = t/P
d) E = PI
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