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WorksheetsAC Theory - DC Review
Total questions: 15
Worksheet time: 15mins
An electric current is defined as the flow of ? through a conductor.
electrons
protons
nuclei
ohms
The unit of electric current is the ? , which is represented by the letter ?
ohm/R
ampere/I
voltage/E
watt/W
In Ohm's law, the letter "I" represents the _________ of current flow.
Inefficiency
Intensity
Opposition
Power
The unit of electrical potential is the ? , which is represented by the letter ? .
ampere/A
resistance/R
volt/V
watt/W
Power in a circuit is the amount of work being done per unit of time
True
False
In Figure PP1–1, if another resistor were added to the two 30 V resistors in parallel, the total resistance of the circuit would go ? .
Up
Down
Stay the same
Alternate
Calculate total circuit current.
1 A
2 A
3 A
4 A
Calculate total circuit power.
120 W
240 W
480 W
960 W
Calculate current flow at each of the 30 Ω resistors.
1 A
2 A
4 A
6 A
Use the reciprocal formula to find the resistance of three resistors 10 ohm, 20 ohm, 30 ohms connected in parallel.
4.5 ohms
5.46 ohms
6 ohms
10 ohms
Write the formula to find the resistance of 1,000 feet of 3,000 cmil copper wire, that has a K factor of 10.5.
P=I×E
R=(K×L)÷Area (cmils)
E=I×R
π=3.14
Using the information in Figure PP1–3, calculate the voltage drop between the source and the load.
10 V
14.7 V
18 V
22 V
Find the actual operating resistance of a 100 W, 120 V lamp.
100 Ω
144 ohms
150 Ω
4160 V
Calculate voltage drop at the 25 Ω resistor.
12 V
50 V
120 V
240 V
In an AC circuit that contains only resistance, find the total current if the total voltage is 120 V and three 20 V resistors are in series.
1 A
2 A
3 A
4 A
