General Chapter 03 Flashcards

Basic Electricity

1
Q

One kilowatt is equal to how many watts?

A

1,000 watts.

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2
Q

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

A

Ohms law.

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3
Q

What are the three elements of Ohm’s law?

A

Voltage, current and resistance.

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4
Q

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

A

E = I X R, R = E/I, l = E/R.

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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.

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6
Q

In DC circuits, what unit measures power?

A

Watts.

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7
Q

What three elements are required to form an electrical circuit?

A

A source of electrical energy, a load or resistance to use the electricity, and wires or conductors to connect the source to the load.

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8
Q

DC circuits can take one of three forms or types. What are they?

A

Series, parallel and complex (or series-parallel).

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9
Q

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

A

Twelve.

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10
Q

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

A

1.275 and 1.300.

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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

Whenever the temperature is less than 70°F or more than 90°F.

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12
Q

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

A

The electrolyte in the two types of batteries is chemically opposite and the fumes from one type can contaminate the electrolyte of the other type.

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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.

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14
Q

What is the principal advantage of AC current 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.

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15
Q

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

A

Resistance, inductive reactance and capacitive reactance.

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16
Q

Define inductance.

A

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

17
Q

What component creates capacitance in AC circuits?

A

A capacitor.

18
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.

19
Q

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

A

The 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 and resistance.