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Flashcards in Basic Electricity Deck (54)
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1

What constitutes a capacitor

two conductors separated by an insulator

2

What is the purpose of a capacitor

It stores electrical energy in electrostatic fields

3

Does a capacitor in an AC circuit cause the current to lead or lag the voltage

It causes the current to lead the voltage

4

The basic unit of a capacitor

The farad

5

The reason why an electrolytic capacitor can only be used in a DC circuit and not an AC circuit.

They are polarized so they can only work in one direction. If current passes in the opposite direction, it will pass through the capacitor and overheat it (explode)

6

What is meant by inductuance

The ability to store electrical energy in electromagnetic fields

7

The basic unit of inductance

The henry

8

What is an example of an inductor used in a magneto

The primary and secondary coils

9

Does an inductor in an AC circuit cause the current to lead or lag the voltage

lags

10

How can you find the polarity of an electromagnet

Hold the electromagnet in your left hand with your fingers encircling the coil int he direction electrons flow (from negative to positive). Your thumb will point to the north pole

11

What is meant by impedance

Total opposition to current flow in an AC circuit. The vector sum of capacitive and inductive reactance and resistance

12

What is the basic unit of impedance

Ohm

13

What are 5 sources of electrical energy

1. Light
2. Radiation
3. Chemical
4. Magnetism
5. Heat

14

What is the basic unit of power in a DC circuit

The watt

15

What is meant by a megawatt

1,000,000 watts

16

What is the formula for power in a DC circuit

P=IV

17

The relationship between mechanical and electrical power

1 horsepower= 746 watts

18

What is meant by true power in an AC circuit

The actual amount of power being used, or dissipated, in a circuit

19

In what unit is true power expressed in

Watt

20

What is meant by apparent power in an AC circuit

The combination of reactive power and true power is called apparent power, and it is the product of a circuit’s voltage and current, without reference to phase angle

21

The basic unit of reactive power

VAR (Volt amps reactive)

22

What is meant by power factor in an AC circuit

The ratio of true power to apparent power or the ratio of circuit resistance to circuit impedance

23

What 2 things happen when current flows through a conductor

1. Heat is generated
2. Magnetic field surrounds the conductor

24

The 4 factors that affect resistance of a conductor

1. Temperature
2. Length
3. Cross sectional area
4. Material

25

What is meant by continuity in an electrical circuit

The circuit is continuous so electrons can flow from one terminal to the next

26

The 3 things that an electrical circuit must have in order to work

1. Supply voltage
2. Consumers
3. Conductors to join the consumers to the supply

27

What would happen to the current in a DC circuit if length of the conductor doubled but all other factors remained the same?

The current would decrease by half

28

What is meant by the capacity rating of a lead-acid battery?

The number of hours a battery can supply a given current flow

29

What is the unit that a battery capacity is expressed in

Ampere-hours

30

What electrolyte is used in a lead acid battery

Sulfuric acid and water