Electric Power and Its Applications

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the unit used to express electrical power?

watts

How is electrical power calculated for a device?

by multiplying the current by the difference between the voltage going into and out of the device

What is the equation to calculate electrical power using current and resistance?

$P = I^2R$

How much power is lost in the house wiring before it gets to the home theater room?

225 watts Signup and view all the answers

How much power is available to power the home theater equipment?

less than 1600 watts Signup and view all the answers

What is the relation between electric power, current, and voltage?

The relation between electric power, current, and voltage can be described by the equation: P = IV, where P is the power in watts, I is the current in amps, and V is the voltage in volts. Signup and view all the answers

What is resistance?

Resistance is a property of a material that opposes the flow of electric current. It is measured in ohms (Ω). Signup and view all the answers

How can you calculate power when given the current and voltage?

Power can be calculated using the equation: P = IV, where P is the power in watts, I is the current in amps, and V is the voltage in volts. Signup and view all the answers

What is the maximum current that can be drawn by the equipment in the home theater room?

The maximum current that can be drawn by the equipment in the home theater room is 15 amps, as indicated by the rating of the circuit breaker. Signup and view all the answers

Why is it important not to overload the circuit breakers?

Overloading the circuit breakers can cause overheating and potentially lead to electrical fires. It is important to ensure that the current drawn by the equipment does not exceed the rating of the circuit breaker to prevent such hazards. Signup and view all the answers

How is power calculated when the voltage difference is unknown?

Power can be calculated by multiplying the current by itself and then multiplying the result by the resistance. Signup and view all the answers

What are the units of power?

The units of power are watts (W), which are equal to joules per second. Signup and view all the answers

How is power calculated when Ohm's law holds?

When Ohm's law holds, the power can be expressed as $P = I^2 R$, where $I$ is the electric current in amperes and $R$ is the resistance in ohms. Signup and view all the answers

How can power be expressed in terms of voltage and resistance?

Power can be expressed as $P = V^2 / R$, where $V$ is the potential difference in volts and $R$ is the resistance in ohms. Signup and view all the answers