S2.27_Power and Ohm's Law

Fill in the Blank

Fill in the blank: The formula for electric power is P = ___ x I.

Multiple Choice

Which formula is used to calculate electric power in a circuit?

• P = V x I

• P = I / V

• P = V + I

• P = V - I

Multiple Choice

Which of formula is used to calculate power using Ohm's Law?

• $$P=\frac{V^2}{R}$$

• $$V=IR$$

• $$R=\frac{V}{I}$$

• $$I=\frac{V}{R}$$

Fill in the Blank

According to Ohm's law, power is calculated as voltage squared divided by ___.

Multiple Choice

If three resistors (5 Ω, 10 Ω, and 15 Ω) are connected in parallel to a 30 V power supply, what is the total power dissipated?

• 720 W

• 388 W

• 240 W

• 330 W

Multiple Select

Which of the following statements are true about power dissipation in series and parallel circuits?

• In series circuits, increasing resistance decreases power dissipation.

• In parallel circuits, adding more resistors increases total power dissipation.

• In series circuits, adding more resistors increases total power dissipation.

• In parallel circuits, increasing resistance increases power dissipation.

Multiple Choice

In a series circuit, two resistors (6 Ω and 12 Ω) are connected to a 24 V power supply. What is the total power dissipated?

• 32 W

• 48 W

• 72 W

• 96 W

Multiple Choice

In a circuit with a 12 V battery and a resistor of 4 Ω, what is the power dissipated?

• 3 W

• 36 W

• 92 W

• 120 W

Multiple Choice

An electric space heater requires a 29 A of 120 V current to adequately warm a room. What is the power rating of the heater?

• 1825 W

• 9084 W

• 3480 W

• 1577 W