Using Electric Energy Section 22.2

If the Voltage is increased and the resistance stays the same, Current will

• Increase
• Decrease
• Stay the same
• Not enough info

If the Voltage stays the same and Resistance is increased, Current will 

• Increase
• Decrease
• Stay the same
• Not enough info

What does power mean?

• Joules transferred per second
• Electron flow per second
• Speed of electrons
• Electron energy

What is the unit of power?

• Ohms

• Volts
• Amps
• Watts

Which of the following equations is an equation for power, involving current and resistance?

• P= I/V

• P = IR

• P = IVR²

• P = I²R

Which of the following is an equation for power, involving voltage and resistance?

• P = V/R

• P = V²/R

• P = VR

• P = V²R²

A kilowatt-hour is equal to ____________ joules.

• 3,600

• 360,000

• 3,600,000

• 360,000,000

Energy equals power multiplied by time; E =Pt. If we want the energy units to be joules, and the power units are watts, what unit does the time need to be in?

• days

• hours

• minutes

• seconds

If electrical power costs $0.12/kwh, and I use 250 kwh of electrical energy, what will I be charged?

• $10

• $20

• $30

• $40

If electrical power costs $0.12/kwh, and I use 9 x 10⁸ Joules of electrical energy, what will I be charged?

• $10

• $20

• $30

• $40