Answer to Question #33648 in Electric Circuits for dale batidor
E EMF, r is internal resistance, R is resistance of whole circuit.
If the circuit is short-circuited then R will be 0 ohm
P(if R=0)=1.5*30=45 w(on internal resistance)
P(if R not 0, light bulb resistance, for example)=1*1.5=1.5 w - is much less
than 45 w
but P(r)=1*0.05=0.05 w(power on internal resistance, with connected light bulb)
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