Understanding Power in DC Circuits

What is the formula to calculate power in a DC circuit?

• P = V × I

• P = V - I

• P = V + I

• P = I / V

If a circuit has a voltage of 10 volts and a current of 2 amps, what is the power?

• 15 watts

• 25 watts

• 20 watts

• 5 watts

Convert 1000 milliwatts to watts.

• 500 milliwatts

• 2 watts

• 1 watt

• 100 milliwatts

What unit is used to measure electrical power?

• ampere

• volt

• ohm

• watt

If a resistive load uses 50 watts, how much energy does it consume in 2 hours?

• 150 watt-hours

• 100 watt-hours

• 75 watt-hours

• 200 watt-hours

Explain what a resistive load is in a circuit.

• A resistive load is a component in a circuit that converts electrical energy into heat, following Ohm's law.

• A resistive load is a component that amplifies electrical signals.

• A resistive load generates magnetic fields in a circuit.

• A resistive load stores electrical energy for later use.

If the power in a circuit is 120 watts and the voltage is 30 volts, what is the current?

• 2 amps

• 6 amps

• 10 amps

• 4 amps

How do you convert kilowatts to watts?

• Divide the kilowatts by 1000.

• Add 1000 to the kilowatts.

• Subtract 1000 from the kilowatts.

• Multiply the kilowatts by 1000.

What is the relationship between voltage, current, and power?

• Power is the product of voltage and current (P = V * I).

• Current is the sum of voltage and power (I = V + P).

• Voltage is the product of power and current (V = P * I).

• Power is the sum of voltage and current (P = V + I).

If a device uses 500 watts, how many kilowatts is that?

• 1 kilowatt

• 750 watts

• 250 watts

• 0.5 kilowatts