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Understanding power equations in electricity

Electricity and circuits • Electrical energy transfers

Key concepts

What you'll likely be quizzed about

  • Power (P) in an electrical circuit measures the rate at which electrical energy is transferred.
  • It is calculated using the formula P = VI, where V represents voltage and I denotes current.
  • A higher power indicates that more energy is consumed per time unit, affecting the efficiency of devices.
  • Understanding this relationship is essential for evaluating power ratings of appliances.

Flashcards

Test your knowledge with interactive flashcards

State Ohm's Law in equation form.

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Ohm's Law can be stated as V = IR, where V is voltage, I is current, and R is resistance.

Key notes

Important points to keep in mind

Power is measured in watts (W).

Voltage is measured in volts (V).

Current is measured in amperes (A).

Resistance is measured in ohms (Ω).

Always use P = VI for power calculations.

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