Elec Class
learn electricity hands-on
Solved exercise · level 3 of 5
Skills: Calculate
At 12 V, three loads are in parallel: R₁ = 12 Ω, R₂ drawing 2 A, and R₃ absorbing 65.5 W. What is the equivalent resistance?
U = 12 V · R₁ = 12 Ω · I₂ = 2 A · P₃ = 65.5 W
Parametric exercise: the values change with every draw; these are one example.
Guided problem in 4 steps: unknown, formula, units, data, result.
R₂ = U / I₂ = 6 Ω; R₃ = U² / P₃ = 2.2 Ω; 1/Req = 1/12 + 1/6 + 1/2.2 → Req = 1.42 Ω.