GPE, KE, & EPE
W & P
Electricity Vocab
Unit 6 Preview
100
Which point has the greatest KE?
What is C?
100
What does it mean to do work (in physics)?
What is change energy in some way.
100
What is electrical current?
What is a measure of the amount of electrical charge transferred per unit time.
100
What is a material that lets electric current pass through?
What is a conductor?
200
As the ball rolls down the hill, the ball speeds up and the outside of the ball gets a little warmer. What energy transformations are occurring?
What is GPE transforming into KE & Thermal Energy.
200
What is power?
What is the rate of change of energy.
200
What is an entire electrical system that generates, transmits, and distributes electric power throughout a region or country?
What is an electrical grid
200
Socks taken from a clothes dryer that stick together or a lightning bolt in the sky are examples of ____________.
What is static electricity?
300
Will the ball make it over the hill on the right? Explain.
What is no, because the total amount of energy in the system remains the same, which means that the ball cannot go any higher than the point which it started from.
300
If you pull with a constant force of 400N, how much mechanical work does it take to pull the pinball launcher back 0.2 meters?
What is 80 J
300
kWh means ______
What is the number of kilowatts of power transferred per hour
300
True or False: Like charges attract and unlike charges repel.
What is False? Like charges repel and unlike charges attract.
400
KE = 1/2 * m * v^2 ; A motor takes the cart up to B; Will the cart have more KE with or without people? Why?
What is with people because KE= 1/2 * m * v^2 so more mass more KE.
400
The spring delivers 200 joules of energy to the ball in 2 seconds. How much power is dissipated?
What is 100 W
400
? = I^2 * R
What is Power
400
What is a resistor?
What is any material that prevents electric current from flowing quickly.
500
What is the velocity of a pinball (m=0.1 kg) launched from a spring k = 400 N/m if it is pulled back by x = 0.2 m? Hint: the spring is horizontal and not vertical.
What is v = 12.6 m/s because v = sq(2 * EPE/m) and EPE = 1/2 * k * x^2
500
How much power does it take to lift a 1000 kg car up to a height of 20 m in only 9.8 sec?
What is 20,000 W
500
What do the variables mean in I^2 * R?
What is I = current and R = resistance
500
What is this called?
What is an electric circuit diagram