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Intro to Electrical Circuits & Electrical Theory Exam
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Terms in this set (27)
A circuit has a source voltage of 50V and a current of 10A. What is the power in watts?
C. 500V
50V = E
10A = I
I x E = P
50 x 10 = 500V
Voltage is defined as the _____.
A. Force that causes electrons to flow
If a circuit has 12 amps of current and the resistance is 20 ohms, the applied voltage is _____.
B. 240V
12A = I
20Ω = R
E = I x R
12 x 20 = 240V
If two 10-ohm resistors are connected in series, what is the total resistance of these resistors?
B. 20 ohms
To make sure the voltage is turned off before touching any terminals, use a(n) _____.
D. Voltage tester
How many amps are there in the current of a circuit if the voltage source is 140V and the resistance is 2 ohms?
B. 70 amps
140V = E
2Ω = R
I = E/R
140/2 = 70A
Materials with electrical characteristics that fall between those of insulators and conductors are considered _____.
C. Semiconductors
What is the applied voltage if the current in a circuit is 60 amps and the resistance is 10 ohms?
C. 600V
60A = I
10Ω = R
E = I x R
60 x 10 = 600V
Which of the following is used to step voltage down to lower levels before it reaches a home or office?
A. Transformer
A 5-ohm and a 20-ohm resistor are connected in parallel. What is the total resistance of these two resistors?
C. 4Ω
5 x 20 = 100
------- = ----- = 4Ω
5 + 20 = 25
If the resistance of a circuit is 25 ohms and the current is 10 amps, the power in watts is ________.
D. 2,500
25Ω x 10A = 250 -------> 250 x 10A = 2,500W (P)
If a circuit has 48 amps of current and an applied voltage of 240 volts, the resistance is _______.
A. 5Ω
48A = I
240V = E
E/I = R
240/48 = 5Ω
You would measure resistance with a(n) _____.
B. Ohmmeter
Which of the following substances is considered a good semiconductor?
C. Silicon
In a parallel circuit, the voltage drop ____.
B. Same across all loads
An electron repels a(n) ____.
C. Electron
Electric charge is measured in ____.
A. Coulombs
An electrical device that operates on the principle of magnetism is a ____.
A. Motor
A mil is equal to ____.
C. 0.001 inch
A resistor has no fourth band. This indicates that the resistor tolerance is ____.
D. 20% Resistance
What is the total resistance of three resistors in parallel with values of 2 ohms, 8 ohms, and 14 ohms?
A. 1.44Ω
(Refer to Notes for diagram
The statement that total current entering a point must equal total current leaving that point best describes _____.
D. Kirchhoff's Current Law
What is the resistance of a light bulb that uses 15 watts of power when placed across a 15- volt battery?
B. 15Ω
A circuit diagram shows that the circuit divides into separate branches and there are also series loads. This is a(n) _____.
D. Series-Parallel circuit
The total resistance of four resistors in parallel with values of 3, 10, 25, and 50 ohms is _____.
B. 2.03Ω
According to Kirchhoff's voltage law, the total voltage drop in a circuit is equal to the _____.
A. Voltage of the power source
The total voltage in a circuit with voltage drops of 15V, 25V, and 20V is _____.
B. 60V
15V + 25V + 20V = 60V
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