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How much energy is used if the TV is on for 3 hours?
current 0.42A
Voltage 120 V |
E = P x t
E= 50.4 W x 3 hours
.0504 kW x 3 hours
= 0.1512 kWh |
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angela Wed, 08 Feb 2012 01:38:51 GMT |
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| What is the power rating of a TV if it draws a current of 0.42 A at 120 V? |
P = V x I
P = 120V x 0.42A
= 50.4 W, or .0504 kW |
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angela Wed, 08 Feb 2012 01:38:51 GMT |
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| Give formula for electrical energy. |
electrical energy = power x time
E = P x t |
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angela Wed, 08 Feb 2012 01:31:05 GMT |
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| What are 2 common units for electric power? |
watts (W)
kilowatts (kW) |
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angela Wed, 08 Feb 2012 01:31:05 GMT |
|
| Give the formula for power. |
power = voltage x current
P = V x I |
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angela Wed, 08 Feb 2012 01:31:05 GMT |
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| The rate at which electrical energy is converted into other forms of energy is _______________. |
electric power |
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angela Wed, 08 Feb 2012 01:31:05 GMT |
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| The resistance of an object is 4 ohms. If the current in the object is 9 A, what voltage must be used? |
R= V divided by I
or V= I x R
V= 9A x 4 ohms
=36 V |
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angela Wed, 08 Feb 2012 00:36:25 GMT |
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| What is the voltage if the current is 0.2A and the resistance is 2 ohms. |
R= V divided by I
or V= I x R
V= 0.2A x 2 ohms
=0.4 V |
1 |
angela Wed, 08 Feb 2012 01:48:25 GMT |
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| What is the voltage if the current is 2A and the resistance is 12 ohms? |
R= V divided by I
or V= I x R
=2A x 12 ohms
=24V |
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angela Wed, 08 Feb 2012 00:36:25 GMT |
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| State Ohm's Law. |
R = V divided by I
resistance (ohms) = voltage (volts) divided by current (amps) |
0 |
angela Wed, 08 Feb 2012 00:36:25 GMT |
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