One kilowatt is equal to how many watts?
1,000 watts.
What law describes the most fundamental or basic relationships in an electrical circuit?
Ohm’s law.
What are the three elements of Ohm’s law?
Voltage, current, and resistance.
How would you write Ohm’s law as an equation?
E = I × R; I = E ÷ R; R = E ÷ I.
If the resistance in a DC circuit remains the same but the voltage doubles, what happens to the amount of current flowing in the circuit?
The current doubles.
What three elements are required to form an electrical circuit?
Source, load, and conductors.
A fully charged lead-acid battery has a specific gravity that varies between what two values?
1.275 to 1.300.
A 24-volt lead-acid battery has how many cells?
12 cells.
You must apply a correction to the specific gravity reading of the electrolyte of a lead-acid battery when the temperature is outside of what two values?
Below 70°F or above 90°F.
What is the reason for having separate facilities for storing and servicing nickel-cadmium and lead-acid batteries?
Opposite electrolytes; fumes can contaminate the other type.
In DC circuits, what unit measures power?
Watts.
The state of charge of a nickel-cadmium battery cannot be determined by measuring the specific gravity of the electrolyte for what reason?
No change in specific gravity of the electrolyte as the battery is charged/discharged.
DC circuits can take one of three forms or types. What are they?
Series, parallel, and series-parallel.
What is the principal advantage of AC current over DC current?
Power can be transmitted long distances efficiently with small wires bc voltage is increased/decreased by transformer.
What are the three causes of opposition to current flow in an AC circuit?
Resistance, inductive reactance, and capacitive reactance.
Define inductance.
Induced voltage opposite in direction to applied voltage.
What component creates capacitance in AC circuits?
A capacitor.
How does a capacitor store electricity?
As an electrostatic field between two conductors separated by an insulator.
What property of an AC circuit is defined by the term “impedance”?
Total opposition to AC current flow.
What are two reasons that might cause a nickel-cadmium battery to fail to deliver its rated capacity?
Faulty cells or cell imbalance.
What electrical values are measured by a typical multimeter?
Voltage, current, and resistance.
What is electrical current?
The flow of electrons in a circuit.
What is the basic unit of current flow?
The ampere (amp).
What part of an amp is a milliamp?
One thousandth (0.001) of an amp.
