lesson 3 chp 1 quiz
If three resistances of values 3 Ω, 4Ω, and 12 Ω are wired in parallel with each other, what is the total resistance of the circuit?
1.5 Ω
If three resistances of values 3 Ω, 4 Ω, and 12 Ω are wired in series with each other, what is the total resistance of the circuit?
19 Ω
If a step-up transformer has windings with 1000 and 500 turns, what is the induced voltage at the secondary winding if 100 volts is being applied to the primary winding?
200 volts
If there were a current flowing of 5 A in a 120-V circuit, what would the resistance be?
24 ohms
If the resistance in a 120-V circuit was 40 Ω, what would the current be in amperes?
3 A
Referring to Figure 12.63 in the text, what size (gauge) wire should be used if the expected amperage draw of a circuit is 60 amperes?
4
If a step-down transformer has windings with 1000 and 500 turns, what is the induced voltage at the secondary winding if 100 volts is being applied to the primary winding?
50 volts
Which of the following statements can best be associated with inductance?
A magnetic field is generated when current flows through a conductor.
All of the following are true regarding DC power except
DC power continually reverses its polarity.
What is the main difference between a fuse and a circuit breaker?
Fuses must be replaced, while circuit breakers can be reset.
Which of the following statements is true regarding circuit protection devices?
GFCIs may detect leaks with more sensitivity than conventional circuit breakers do.
The nucleus of an atom contains which particles?
Neutrons and protons
Which of the following represents an accurate formula for power?
P = E × I
Which of the following represents Ohm's law?
R = E ÷ I
Impedance is the total effect of what three electrical characteristics?
Resistance, inductive reactance, and capacitive reactance
Which of the following is a correct formula for the total resistance in a series circuit?
Rtotal = R1 + R2 + R3 + ...
If an atom has a net positive charge, which of the following is correct?
The atom has lost electrons.
A solenoid can be described as
a coil of wire.
A diode is a solid-state circuit component that
allows current to flow in only one direction.
The _________ is that part of an atom that moves from one atom to another.
electron
The most common method used to measure the amperage in a circuit is to
energize the circuit and use a clamp-on ammeter to clamp around one conductor in the circuit.
All of the following statements are true regarding good conductors of electricity except
good conductors of electricity pass protons from atom to atom.
The law of charges states that
like charges repel each other and unlike charges attract each other
Voltage can be produced when a conductor passes through a(n)
magnetic field.
The unit of measurement for the charge a capacitor can store is the
microfarad.
An NPN transistor is made up of
one section of P-type material and two sections of N-type material.
The opposition to current flow in a circuit is commonly referred to as
resistance.
A residential AC power supply is often represented by a
sine wave.
Two common types of capacitors are the
start and run.
All of the following are required in an electric circuit except a
switch.
Undersized wires can cause
voltage drops, tripped circuit breakers, and overheating.
Electrical power is measured in
watts.
