Hvac Unit 12

Front 1

Formula for Wattage

Back 1

W=V x A

Front 2

Ohm's Law

Back 2

If you increase current; you increase voltage. The higher the resistance, the lower the current.

Front 3

Ohms

Back 3

Measures resistance

Front 4

Voltage

Back 4

The force that moves electrons (current) through a conductor (EMF)- Electromagnetic force.

Front 5

Amperage (Amps)

Back 5

The rate at which electricity flows (Through a conductor).

Front 6

Examples of CONDUCTORS

Back 6

Gold, copper, aluminum (The conductors allow the flow of electrons)

Front 7

Examples of INSULATORS

Back 7

Rubber, plastic, glass, (These insulators block the flow of electrons)

Front 8

Electrical problem: What is the total amperage of a parallel circuit with a total resistance of 15 ohm's and a voltage of 30V?

Back 8

(I=E/R) 30/15= 2 Amps

Front 9

Electrical energy can be measured in units called:

Back 9

Joules

Front 10

The unit used to measure current is:

Back 10

Watts (W) or Volts x Amperes (VA)

Front 11

Circuit

Back 11

The path of electron flow.

Front 12

Needed for a complete electrical circuit:

Back 12

Power source, a conductor, and a load.

Front 13

Two types of electrical current:

Back 13

Direct Current (DC)- Current flows only in one direction

Alternating Current (AC)- Current flows back and forth (60 times per minute in U.S.)

Front 14

Energy can be produced CHEMICALLY in a:

Back 14

Battery

Front 15

Energy can be produced MECHANICALLY by a:

Back 15

Generator

Front 16

What causes a breaker to trip?

Back 16

Overload (heat)

Front 17

What shuts off power in a circuit if the circuit becomes overloaded?

Back 17

Circuit breaker

Front 18

Branches

Back 18

In a parallel circuit, branches are the different routes the current flows through.

Front 19

Step-up Transformers

Back 19

The number of turns of wire is GREATER in the SECONDARY winding; OUTPUT VOLTAGE will be GREATER than in INPUT voltage.

Front 20

Step-down Transformers

Back 20

The number of turns of wire is GREATER in the PRIMARY winding than in the SECONDARY winding; OUT VOLTAGE will be LESS THAN THE input VOLTAGE.