Electricity 1 — DC Circuits

Ohm’s law & power

I = V/R: double the push, double the flow; double the squeeze, half the flow. Power — how fast electrical energy becomes heat or light — is P = V·I.

V_{s} := 12 V

= 12 V supply voltage

R_{1} := 60 ohm

= 60 ohm

I_{1} = \frac{V_{s}}{R_{1}}

= 0.2 A current through R₁

P_{1} = V_{s} \cdot I_{1}

= 2.4 W power dissipated