Equations
In the following equation W = (∆V) x q what does the "∆" mean?
Difference in Voltage
1 Volt x Coulomb is also equal to a _____?
Joule
How much electrical work is done if a charge of 18 volts moves 5000 coulombs of charge?
90,000 Joules
What is the equation to find efficiency?
Work out / Work in
What does the variable "t" stand for?
time
A DC electric motor operates for 15 seconds with a charge of 30 coulombs. What is the current?
2 Amps
What is the equation to find work?
Work = Voltage difference x Charge moved
What does the variable "q" stand for?
Charge Moved
A DC electric motor operates for 2 minutes on a voltage of 12 volts while drawing a current of 4 amperes. What is the charge?
480 Coulombs
What is the equation to find current?
Current = Charge / Time
What does the variable "I" stand for and what is the unit used?
I = Current
Unit = Amps
An electric motor has an input energy of 4000 joules. The motor is connected to a crane that can lift 1000 newtons a height of 2.5 meters.
What is the efficiency of the motor?
62.5%
1 Amp-sec is also equal to 1 ______?
1 Coulomb
1 Coulomb = How many electrons
6.25 x 1018 electrons
An automobile is active for 2 seconds. It draws a current of 15 amperes at a voltage of 12 volts. What is the work done?
360 Joules