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Flashcards in Basic Electricity Deck (13)
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1
Q

What law describes the most fundamental or basic relationships in an electrical circuit?

A

Ohm’s Law

2
Q

In DC circuits, what unit measures power?

A

Watts

3
Q

What three elements are required to form an electrical circuit?

A

A source of electrical energy, a load or resistance, and a wire or conductor to connect the source to the load.

4
Q

A 24v lead-acid battery has how many cells?

A

12 cells

5
Q

A fully charged lead-acid battery has a specific gravity that varies between what two values?

A

1.275 and 1.300

6
Q

You must apply a correction to the specific gravity reading of the electrolyte of a lead-acid battery when the temperature is outside what two values?

A

70 or 90 degrees Fahrenheit

7
Q

What is the principal advantage of using AC over DC current?

A

Power can be transmitted over long distances more efficiently and with smaller wires because the voltage can be easily increased or decreased by a transformer.

8
Q

What are the three causes to opposition to current flow in an AC circuit?

A

Resistance, inductive reactance, and capacitive reactance

9
Q

Define inductance

A

An induced voltage which is opposite in direction to the applied voltage

10
Q

What component creates capacitance in AC circuits?

A

A capacitor

11
Q

How does a capacitor store electricity?

A

The energy is stored in the form of an electrostatic charge or field that exists between two conductors separated by an insulator

12
Q

What property of an AC circuit is defined by the term “impedance”?

A

The total opposition to current flow

13
Q

What are two reasons that might cause a NiCad battery tp fail to deliver its rated capacity?

A

Faulty cells or cell imbalance