# Chapter 3 Oral Questions Flashcards

One kilowatt is equal to how many watts?

1,000

What law describes the basic relationships in an electrical circuit?

Ohm’s law

What are the three elements of Ohm’s law?

Voltage, Current, Resistance

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

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

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

In DC circuits, what unit measures power?

Watts

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)

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

Series, Parallel, or Series-Parallel

A 24 volt lead acid battery has how many cells?

12

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

1.275 and 1.300

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

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

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

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

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

Resistance, Inductive reactance, and Capacitive reactance