Electrical Circuits and Power Calculations

The video tutorial explains a circuit with an 18-volt source and three resistors. It covers calculating total resistance, determining current using Ohm's Law, finding voltage across each resistor, and calculating power absorbed by resistors and delivered by the battery. The tutorial emphasizes the importance of direction in current and voltage calculations.

What is the direction of the current in relation to the voltage source in the circuit?

• Upward

• Counterclockwise

• Clockwise

• Downward

How do you calculate the total resistance in a series circuit?

• Add all resistances

• Divide the total voltage by the total current

• Multiply all resistances

• Subtract the smallest resistance from the largest

What is the formula used to calculate the current in the circuit?

• R = V / I

• V = I * R

• I = V / R

• P = V * I

How is the voltage across a resistor calculated?

• V = R / I

• V = I / R

• V = P / I

• V = I * R

What is the voltage across the second resistor if the current is 9/4 amps and the resistance is 4 ohms?

• 9 volts

• 18 volts

• 4.5 volts

• 2.25 volts

Which formula can be used to calculate the power absorbed by a resistor?

• P = V^2 / R

• P = I^2 * R

• P = V * I

• All of the above

What is the power absorbed by the first resistor if the current is 9/4 amps and the resistance is 2 ohms?

• 81/8 watts

• 9 watts

• 81/4 watts

• 18 watts

How is the total power delivered by the battery calculated?

• P = R / I

• P = V * I

• P = I^2 * R

• P = V^2 / R

What is the total power delivered by the battery if the voltage is 18 volts and the current is 9/4 amps?

• 9 watts

• 18 watts

• 36 watts

• 81/2 watts

What should the sum of the power absorbed by all resistors equal?

• The total power delivered by the battery

• The total resistance of the circuit

• The total current of the circuit

• The total voltage of the circuit