QuantityFormulasUnit Current I I = Q / tQ = Charget = time taken Amperes (A) VOLTAGE VV = E / QorV = W / QE = Energy, W = Work done VOLTS (V) Resistance R R = ρl / Aρ = Resistivity,l = LENGTH,A = AREA Ohm (Ω) Resistance R R = V / I ohm (Ω) Power P P = VI Watts (W) Conductivity σ sigma = 1 / ρ Siemens per meter (S/m)
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