# Chapter 3 Oral Questions Flashcards

1
Q

One kilowatt is equal to how many watts?

A

1,000

2
Q

What law describes the basic relationships in an electrical circuit?

A

Ohm’s law

3
Q

What are the three elements of Ohm’s law?

A

Voltage, Current, Resistance

4
Q

How would you write Ohm’s law as an equation?

A

E= I X R, R=E/I, I=E/R

5
Q

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?

A

It also doubles

6
Q

In DC circuits, what unit measures power?

A

Watts

7
Q

What three elements are required to form an electrical circuit?

A

A source of electrical energy, a load or resistance to use electricity, and wires or conductors to connect them (source, load, conductor)

8
Q

DC circuits can take one of three forms or types, what are they?

A

Series, Parallel, or Series-Parallel

9
Q

A 24 volt lead acid battery has how many cells?

A

12

10
Q

A fully charged lead acid battery has a specific gravity range between what two values?

A

1.275 and 1.300

11
Q

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?

A

when temp is less than 70 or more than 90 Fahrenheit

12
Q

What is the reason for having separate facilities for storing and servicing nickel-cadmium and lead-acid batteries?

A

The electrolytes are chemically opposite and the fumes from one can contaminate the electrolyte of the other

13
Q

The state of charge of a nickel-cadmium battery cannot be determined by measuring the specific gravity of the electrolyte for what reason?

A

There is no significant change in the specific gravity of the electrolyte as the battery is charged or discharged in Ni-Cad batteries

14
Q

What is the principal advantage of AC over DC?

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

15
Q

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

A

Resistance, Inductive reactance, and Capacitive reactance

16
Q

Define Inductance

A

An induced voltage which is opposite the direction of the applied voltage

17
Q

What component creates capacitance in AC circuits?

A

a Capacitor

18
Q

How does a capacitor store electricity?

A

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

19
Q

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

A

Total opposition to current flow

20
Q

What are two reasons that might cause a nickel-cadmium battery to fail to deliver its rated capacity?

A

Faulty cells or cell imbalance

21
Q

What electrical values are measured by a typical multimeter ?

A

Voltage, Current, Resistance

22
Q

What is the Ohm’s Law formula to find Power?

Volts?

A

Power: P = I x E

Volts: E = I x R