Study Electrical Calculations Flash Cards

 
Pile Management Card
Electrical Calculations

loading
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
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
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
Give formula for electrical energy.
electrical energy = power x time
E = P x t
What are 2 common units for electric power?
watts (W)
kilowatts (kW)
Give the formula for power.
power = voltage x current
P = V x I
The rate at which electrical energy is converted into other forms of energy is _______________.
electric power
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
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
State Ohm's Law.
R = V divided by I
resistance (ohms) = voltage (volts) divided by current (amps)
Place this card into pile: