Power in D.C. Circuits

Power

The energy transferred per unit time, measured in watts (W).

Watts

The unit of power, equivalent to one joule per second (1 W = 1 J/s).

Potential Difference

The difference in electric potential between two points, measured in volts (V).

Current

The flow of electric charge, measured in amperes (A).

P = V × I

Formula for calculating electrical power, where P is power in watts, V is potential difference in volts, and I is current in amperes.

Series Circuit

A circuit in which the current is the same through each resistor.

Parallel Circuit

A circuit in which the voltage is common to each resistor.

Ohm's Law

A law stating the relationship between voltage (V), current (I), and resistance (R), typically expressed as V = I × R.

Power in D.C. Circuits

The calculation of electrical power in direct current circuits, using specific formulas.

P = V²/R

Alternative formula for calculating power, where V is the potential difference and R is the resistance.