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Answer to Question #61534 in Other Physics for na

Question #61534


4 An electrical source with internal resistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?

R+rR
R+rR

R−rR
R−rR

RR+r
RR+r

Rr
Rr
5 A battery of emf E and negligible internal resistance is connected to two resistances
R1
R1
and
R2
R2
in series. What the potential difference across
R2
R2
?

E(R1+R2)R2
E(R1+R2)R2

E(R1+R2)R1
E(R1+R2)R1

ER2R1+R2
ER2R1+R2

ER1R1+R2
ER1R1+R2
6 The electric current as a function of voltage of a wire is presented by the graph. What is the power dissipated in the resistor when the applied voltage is 5 V?
Click here to see exhibit
5 W
10 W
15 W
20 W
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