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20 Cards in this Set
- Front
- Back
Formula for Wattage |
W=V x A |
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Ohm's Law |
If you increase current; you increase voltage. The higher the resistance, the lower the current. |
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Ohms |
Measures resistance |
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Voltage |
The force that moves electrons (current) through a conductor (EMF)- Electromagnetic force. |
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Amperage (Amps) |
The rate at which electricity flows (Through a conductor). |
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Examples of CONDUCTORS |
Gold, copper, aluminum (The conductors allow the flow of electrons) |
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Examples of INSULATORS |
Rubber, plastic, glass, (These insulators block the flow of electrons) |
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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 |
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Electrical energy can be measured in units called: |
Joules |
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The unit used to measure current is: |
Watts (W) or Volts x Amperes (VA) |
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Circuit |
The path of electron flow. |
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Needed for a complete electrical circuit: |
Power source, a conductor, and a load. |
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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.) |
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Energy can be produced CHEMICALLY in a: |
Battery |
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Energy can be produced MECHANICALLY by a: |
Generator |
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What causes a breaker to trip? |
Overload (heat) |
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What shuts off power in a circuit if the circuit becomes overloaded? |
Circuit breaker |
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Branches |
In a parallel circuit, branches are the different routes the current flows through. |
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Step-up Transformers |
The number of turns of wire is GREATER in the SECONDARY winding; OUTPUT VOLTAGE will be GREATER than in INPUT voltage. |
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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. |