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25 Cards in this Set
- Front
- Back
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What are the two types of power? |
Electrical power Mechanical power |
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What is Mechanical power measured in? |
Hoesepower |
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What is electrical power measured in? |
Watts |
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Whow many watts in 1 horsepower |
746 |
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How to calculate Force? |
Force= Mass(kg) x Gravity (9.8) |
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What is force measured in? |
Newtons |
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What is work measured in? |
Joules |
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Calculate work? |
Work= force (N) x Distance (M) |
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How to calculate Power? |
Power=work (j) ÷ Time (sec.) |
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What is Power Rating? |
Max power a device can handle. |
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Calculate efficiency |
Power out ÷ power in x 100 |
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What is a possible consequence when the power capability of a resistor is exceeded. |
Burn out or shorten life of resistor. |
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Explain how powet capability of a resistor can be surpassed. |
Bu increasing the current or voltage untill the resistor is surpassed. |
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What effect does watt rating of a resistor have on the current flow through theresistor. |
None, unless the max heat dissipating capability of the resistor is exceeded. |
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What effect does watt rating of a resistor have on the current flow through theresistor. |
None, unless the max heat dissipating capability of the resistor is exceeded. |
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What will happen to an electric heater if connected to a voltage greater than its rated voltage. |
Life of heater will shorten and possibly burn out. |
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What is efficiency of transmition? |
Is the ratio of how much power makes it to the load. |
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What is line loss? |
Is the power in watts lost in the form of heat through conductors feeding loads. |
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What insturment is used to measure total energy consumed? |
Kw/h meter |
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What unit is used for total energy consumed? |
kw/h |
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What is the mechanical unit of power? |
Horsepower |
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What is efficiency of apparatus? |
The amount of pawer that comes out of a motor compared to the amount going in. |
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4 factors that determine resistance of a wire? |
Gauge Temperature Length Material |
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1 mil = _____ inch? |
1/1000 inch |
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Nsmpe 3 principal power formulas |
P=EI P=I^2÷R P=E^2÷R |
