Basic Electricity

Question 1

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

Answer 1

Ohm’s Law

Question 2

In DC circuits, what unit measures power?

Answer 2

Watts

Question 3

What three elements are required to form an electrical circuit?

Answer 3

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

Question 4

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

Answer 4

12 cells

Question 5

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

Answer 5

1.275 and 1.300

Question 6

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?

Answer 6

70 or 90 degrees Fahrenheit

Question 7

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

Answer 7

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.

Question 8

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

Answer 8

Resistance, inductive reactance, and capacitive reactance

Question 9

Define inductance

Answer 9

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

Question 10

What component creates capacitance in AC circuits?

Answer 10

A capacitor

Question 11

How does a capacitor store electricity?

Answer 11

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

Question 12

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

Answer 12

The total opposition to current flow

Question 13

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

Answer 13

Faulty cells or cell imbalance