# Answer on Other Physics Question 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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