Understanding Power in Circuits

What is the formula for calculating electrical power in a circuit?

• Power = Voltage + Current

• Power = Voltage * Current

• Power = Voltage / Current

• Power = Current - Voltage

In a simple circuit, the voltage is 10V and the current is 2A. What is the power?

• 5W

• 10W

• 20W

• 25W

Which of the following is the unit of power?

• Volt

• Ampere

• Watt

• Ohm

A circuit has a voltage of 15V and a current of 3A. Calculate the power.

• 30W

• 45W

• 50W

• 60W

If the power in a circuit is 50W and the current is 5A, what is the voltage?

• 5V

• 10V

• 15V

• 20V

Match each Circuit property.

• Voltage

• The units for Current

• Watts

• The rate at which electrical energy is converted to another form of energy

• Current

• The units for Power

• Power

• The amount of Charge difference in a circuit

• Amps

• The amount of electrons flowing through a circuit

How much current will flow through this circuit when the switch is closed, if the source 9V and the bulb is 18W

• 1A

• 9A

• 2A

• 18A

If this wind generator can produce 2MW (2*10^6), when the wind is blowing, how many houses can it power if the average house runs on 10kW (1*10^4)?

• 100

• 150

• 200

• 250

Tags

NGSS.HS-PS3-3

Which best describes the electron flow in this diagram

• Excess electrons flow from the anode thru the bulb to the cathode.

• Excess electrons flow from the anode thru the electrolyte to the cathode.

• Excess electrons flow from the cathode thru the bulb to the anode.

• Excess electrons flow from the anode thru the electrolyte to the cathode.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?

• 440 W

• 110 W

• 55 W

• 0.0023 W