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 amount of electrons flowing through a circuit

• Watts

• The amount of Charge difference in a circuit

• Power

• The units for Current

• Current

• The units for Power

• Amps

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

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