An electrical source with internal reistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?(a)R+r/R(b)R-r/R (c)R/R+r (d)R/r

1 answer

Total resistance is R+r, so
R/(R+r) of the power is delivered to the load.

A good worksheet on this is to be found at

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/autbat.html#c2
Similar Questions
  1. An incandescent lamp is marked '120v,75W'a)what is the current in the lamp under normal condition of operation? b)How much does
    1. answers icon 1 answer
  2. Match each description or drawing to the correct part of a circuit.Column A 1. Any device that uses electrical current to
    1. answers icon 1 answer
  3. Match each description or drawing to the correct part of a circuit.Column A 1. Any device that uses electrical current to
    1. answers icon 1 answer
    1. answers icon 1 answer
more similar questions