Electrical Energy and Power Quiz

What is the formula for potential difference derived from its definition?

• V = IR

• V = W/Q

• V = Q/W

• V = I^2R

How is electrical work done related to energy?

• Work done is unrelated to energy

• Work done is equal to the energy used

• Work done is double the energy used

• Work done is half the energy used

Which formula can be used to calculate electrical energy when charge is not given?

• E = W/T

• E = V^2/R

• E = VIT

• E = I^2R

What is the definition of power in terms of work done?

• Power is the rate of energy supply

• Power is the rate of work done

• Power is the total energy used

• Power is the total work done

Which formula represents electrical power in terms of current and voltage?

• P = IV

• P = I^2R

• P = V^2/R

• P = W/T

If the current is 0.5 A and resistance is 100 ohms, what is the power loss in the resistor?

• 100 W

• 50 W

• 25 W

• 12.5 W

What is the formula for power derived from Ohm's Law and resistance?

• P = IV

• P = V^2/R

• P = W/T

• P = I^2R

How can you express current using voltage and resistance?

• I = V^2/R

• I = V/R

• I = R/V

• I = R^2/V

What is the third formula for electrical power involving voltage and resistance?

• P = W/T

• P = V^2/R

• P = I^2R

• P = IV

What is the unit of power?

• Joule

• Watt

• Volt

• Ampere