Question 12.1. A battery has an e.m.f. of 12.8V and supplies a current of 3.2A. What is the resistance of the circuit? How many coulombs leave the battery in 5 minute?

Question 12.2. A carbon electrode has a resistance of 0.125Ω and 20C. The temperature co-efficient of carbon is -0.0005 at 20C. What will be the resistance of the electrode at 85C.

Question 12.3. Calculate the resistance of wire 10m long that has a diameter of 2mm and resistivity of 2.63 x10-2 Ωm.

Question 12.4 A typical 12V automobile battery has a resistance of 0.012Ω. What is the terminal voltage of this battery when the starter draws a current of 100Z? Calculate the R, Pe, PR and Pr.

Question 12.5. A 10 watt resister has a value of 120Ω. What is the rated current through the resister?

Question 12.6. A resister of 50 Ω has a P.D of 100V, D.C. across 1 hour. Calculate (a). Power and (b) Energy.

Question 12.7. Calculate the current through a single loop circuit if E = 120V, R=1000Ω and internal resistance r=0.01Ω.

Question 12.8. Fine the current flowing the resistors of the fig.

Question 12.9. Find the terminal potential difference of each cell in circuit of figure.

Question 12.10. The voltmeter is the circuit at the right may be considered to be ideal. Values are e=10.0V, internal resistance r=5.00Ω, R1=100Ω, R2 =300Ω. Calculate the current R1.