3 Basic Electricity Flashcards

1
Q
  1. One kilowatt is equal to how many watts?
A

1000

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2
Q
  1. What law describes the most fundamental or basic relationships in an electrical circuit?
A

Ohm’s Law.

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3
Q
  1. What are the 3 elements of Ohm’s Law?
A

Voltage, current, and resistance.

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4
Q
  1. How would you write Ohm’s Law as an equation?
A

E=IR, R=E/R, I=E/R

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5
Q
  1. 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
  1. In DC circuits, what unit measures power?
A

Watts

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7
Q
  1. What 3 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
  1. DC circuits can take 1 of 3 forms or types, what are they?
A

Series, parallel, complex

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9
Q
  1. A 24V lead acid battery has how many cells?
A

12

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10
Q
  1. A fully charged lead acid battery has a specific gravity that varies between what 2 values?
A

1.275 and 1.300

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11
Q
  1. You must apply a correction to the specific gravity reading of the electrolyte of a lead acid battery when the temp is outside of what 2 values?
A

Below 70 degrees or above 90 degrees.

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12
Q
  1. What is the reason for having separate facilities for storing and servicing nickel cadmium and lead acid batteries?
A

The electrolyte in the 2 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
  1. The state of charge of a nickel cadmium battery can’t 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
  1. 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
  1. What are the 3 causes of opposition to current flow in an AC circuit?
A

Resistance, inductive reactance, and capacitive reactance.

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16
Q
  1. Define inductance.
A

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

17
Q
  1. What component creates capacitance in AC circuits?
A

A capacitor.

18
Q
  1. How does a capacitor store electricity?
A

The energy is stored in the form of an electrostatic charge or field that exists between 2 conductors separated by an insulator.

19
Q
  1. What property of an AC circuit is defined by the term impedance?
A

The total opposition to current flow.

20
Q
  1. What are 2 reasons that might cause a nickel cadmium battery to fail to deliver its rated capacity?
A

Faulty cells or cell imbalance.

21
Q
  1. What electrical values are measured by a typical multimeter?
A

Voltage, current, and resistance.