P ) in a circuit is the rate at which ENERGY is absorbed or produced within a circuit.2) A source of energy such as a VOLTAGE will produce or deliver power while the connected load absorbs it.NOTE: The higher their value or rating in watts the more electrical power they are likely to consume.Mathematically power is represented as:P = V × IP = V2/RP = I2 × RPower triangle is shown belowTellegen's theoremPower delivered by source = Power absorbed by all elementsCalculation:Given amplifier supply 12 VAC voltage of 10 V peak then SIGNAL is V(t) = Vmsin(ωt) or V(t) = Vmcos(ωt)Vm = 10 VLoad resistance is 1 KΩRMS value of the sinusoidal signal is\({V_{rms}} = \frac{{{V_m}}}{{\sqrt 2 }}\)Power delivered by the amplifier isP = 12 V × (10 + 10) mAP = 240 mWPower absorbed by the load\(P = \frac{{V_{rms}^2}}{R}\)\({P_L} = \frac{{{{\left( {\frac{10}{{\sqrt 2 }}} \right)}^2}}}{{1\;K{\rm{\OMEGA }}}}\)PL = 50 mWDissipated power isPdis = 240 mW – 50 mWPdis = 190 mW