Chapter 3 Oral Questions Flashcards Preview

A&P Technician GENERAL > Chapter 3 Oral Questions > Flashcards

Flashcards in Chapter 3 Oral Questions Deck (22):
1

One kilowatt is equal to how many watts?

 

1,000

2

What law describes the basic relationships in an electrical circuit?

Ohm's law

A image thumb
3

What are the three elements of Ohm's law?

Voltage, Current, Resistance

4

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

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

A image thumb
5

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?

 

It also doubles

6

In DC circuits, what unit measures power?

 

Watts

7

What three elements are required to form an electrical circuit?

 

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

A image thumb
8

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

Series, Parallel, or Series-Parallel

9

A 24 volt lead acid battery has how many cells?

12

10

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

 

1.275 and 1.300

11

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?

when temp is less than 70 or more than 90 Fahrenheit

12

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

 

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

13

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

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

14

What is the principal advantage of AC over DC?

 

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

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

 

Resistance, Inductive reactance, and Capacitive reactance

16

Define Inductance

 

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

17

What component creates capacitance in AC circuits?

a Capacitor

18

How does a capacitor store electricity?

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

19

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

Total opposition to current flow

20

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

 

Faulty cells or cell imbalance

21

What electrical values are measured by a typical multimeter ?

 

Voltage, Current, Resistance

22

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

Volts?

Power:  P = I x E

Volts:  E = I x R

A image thumb