Electricity Calculations

What is the formula to calculate electrical power?

• Power (P) = V + I

• Power (P) = V / I

• Power (P) = I x V

• Power (P) = V x I

If a current of 2A flows through a resistor of 5 ohms, what is the voltage across the resistor?

• 15V

• 5V

• 20V

• 10V

Calculate the resistance if a current of 0.5A flows through a 12V bulb.

• Resistance (R) = 12V / 0.5A = 24 ohms

• Resistance (R) = 0.5V / 12A = 0.0417 ohms

• Resistance (R) = 12V * 0.5A = 6 ohms

• Resistance (R) = 12V + 0.5A = 12.5 ohms

What is the formula to calculate electrical energy?

• E = m x g x h

• E = V x I

• E = P x t

• E = F x d

If a current of 3A flows through a resistor for 5 minutes, how much charge has passed through it?

• 25 Coulombs

• 15 Coulombs

• 20 Coulombs

• 10 Coulombs

A circuit has a resistance of 10 ohms and a current of 0.2A. Calculate the voltage across the circuit.

• 15 volts

• 2 volts

• 0.1 volts

• 5 volts

What is the formula to calculate current?

• I = R / V

• I = V + R

• I = V / R

• I = V * R

If a 24V battery is connected to a resistor of 6 ohms, what is the current flowing through the resistor?

• 8A

• 2A

• 6A

• 4A

Calculate the power consumed by a device that operates at 120V and draws a current of 2A.

• 300W

• 180W

• 240W

• 100W

A circuit has a power of 100W and a current of 5A. Calculate the resistance of the circuit.

• 10 Ohms

• 4 Ohms

• 20 Ohms

• 2 Ohms