Question 1

What does Ohm's law state?

Accepted Answer

Voltage (V) = Current (I) * Resistance (R). It is the foundation for DC circuit calculations.

Question 2

How do I calculate power?

Accepted Answer

P = V * I = I^2 * R = V^2 / R for resistive loads.

Question 3

Series vs parallel—what changes?

Accepted Answer

Series adds resistances; parallel adds conductances. Voltage and current divide differently in each.

Question 4

What about AC and power factor?

Accepted Answer

For AC, apparent power S = V_rms * I_rms; real power P = S * pf; reactive power Q = S * sin phi.

Question 5

Safety tips?

Accepted Answer

De-energize circuits, verify with a meter, and respect voltage/current ratings.

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