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20 Cards in this Set

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  • Back

Formula for Wattage

W=V x A

Ohm's Law

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


Measures resistance


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

Amperage (Amps)

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

Examples of CONDUCTORS

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

Examples of INSULATORS

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

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

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

Electrical energy can be measured in units called:


The unit used to measure current is:

Watts (W) or Volts x Amperes (VA)


The path of electron flow.

Needed for a complete electrical circuit:

Power source, a conductor, and a load.

Two types of electrical current:

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

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

Energy can be produced CHEMICALLY in a:


Energy can be produced MECHANICALLY by a:


What causes a breaker to trip?

Overload (heat)

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

Circuit breaker


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

Step-up Transformers

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

Step-down Transformers

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.