An electric current is defined as the flow of ? through a conductor.
a.
electrons
b.
neutrons
c.
nuclei
d.
protons
The correct answer is: electrons
The unit of electric current is the ? , which is represented by the letter ? .
a.
ampere / A
b.
ohm / R
c.
volt / V
d.
watt / W
The correct answer is: ampere / A
Opposition to current flow is called ? , the unit of which is represented by the symbol
? .
a.
ampere / A
b.
resistance / Ω
c.
volt / V
d.
watt / W
The correct answer is: resistance / Ω
The unit of electrical potential is the ? , which is represented by the letter ? .
a.
ampere / A
b.
resistance / R
c.
volt / V
d.
watt / W
The correct answer is: volt / V
The unit of electrical power is the ? , whose symbol is ? ,
a.
ampere / A
b.
resistance / R
c.
volt / V
d.
watt / W
The correct answer is: watt / W
Which equation expresses Ohm's Law in its simplest form?
a. P = E x I
b. I^2 x R = P
c. P = E^ 2/R
d. E= I x R
d. E= I x R
If the voltage in a given circuit is increased, the current will ? , but if the resistance is
increased, then the current will ? .
a.
decrease / decrease
b.
decrease / increase
c.
increase / decrease
d.
increase / increase
The correct answer is: increase / decrease
Solve for the current in the circuit. (Round the FINAL answer to three decimal places.)
Answer:
The correct answer is: 2.182 A
Solve for the unknown value in the following circuit. (Hint: Electrical equations are
designed to be solved in base units, amps, ohms, volts or watts.)
Answer:
The correct answer is: 2500 Ω
Solve for the unknown value (E) in the circuit.
Answer:
The correct answer is: 120 V
Power in a circuit is the amount of work being done per unit of time.
Select one:
True
False
The correct answer is 'True'.
One horsepower equals ? watts.
a.
467
b.
674
c.
746
d.
764
The correct answer is: 746
Which of the following represents a formula that can be used to find power?
I.
II.
III.
IV.
V.
a.
I., II., and III.
b.
I., II., and IV.
c.
I., II., and V.
d.
II., III., and IV.
The correct answer is: I., II., and V.
A 1,000-watt lamp operates on 240 volts. How much current does it draw? (Round the
FINAL answer to three decimal places.)
Answer:
The correct answer is: 4.167 A
How much power is required by a 1/4-hp motor? (Neglect I R losses.)
Answer:
The correct answer is: 186.5 W
The current through a lamp is 1.25 amperes when the lamp is connected to a 12-volt
battery. How much power is consumed by the lamp?
Answer:
The correct answer is: 15 W
A heating element in a heater has a resistance of 25 ohms and draws a current of 10
amperes. How much power is dissipated in the heater?
Answer:
The correct answer is: 2500 W
Which is the correct formula for determining total resistance in series circuits?
c.
Which is the correct formula for determining total resistance in any parallel circuit?
d.
Find the total resistance in the following circuit.
Answer:
The correct answer is: 582.8 Ω
Find the total resistance in the following circuit.
Answer:
The correct answer is: 100 Ω
Find the total resistance in the following circuit.
Answer:
The correct answer is: 100 Ω
Solve for the current through R in the following circuit.
Answer:
The correct answer is: 0.25 A
Solve for the current through R in the following circuit.
Answer:
The correct answer is: 1.6 A
Solve the circuit to find the total resistance. (Round the FINAL answer to the nearest
whole number of ohms.) The resistance values are in kilo-ohms (1000 ohms). Note: The
values calculated for this question will be used for additional questions.
The correct answer is: 5536 Ω
Solve circuit to find I . (Round the FINAL answer to four decimal places.)
Click on the image to view a larger version of it.
Answer:
The correct answer is: 0.0109 A
Using the electron theory, determine if the direction of current flow through each of the
resistors and the polarity of the voltage drop across each of the resistors in the circuit is
correct as indicated.
Select one:
True
False
The correct answer is 'True'.
In this circuit, four 120-volt/100-watt lamps are connected in parallel. Each lamp will not
have a 120-volt drop across it and, therefore, will not dissipate the 100 watts of power it
is rated for.
Select one:
True
False
The correct answer is 'False'.
Solve for the voltage across R .
Answer:
The correct answer is: 275 V
Solve for the voltage across R .
Answer:
The correct answer is: 5.5 V
Solve for the voltage across R .
Answer:
The correct answer is: 75 V
What voltage is delivered to a 120-volt/5,000-watt load that is fed with #10 AWG wire
(1.24 ohms/1,000 feet) and located 750 feet from the 120-volt source? (Round the FINAL
answer to two decimal places.)
Answer:
The correct answer is: 72.91 V