Numerical Problems | Chapter 12 Current Electricity l 2nd Year Physics Inter Part 2 | KPK Textbook

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? Two light bulbs designed for 120V use are rated at 40W and 60W. Which light bulb has the greater filament resistance? Why? A carbon electrode has a resistance of 0.125Ω at 20oC. The temperature co-efficient of carbon is -0.0005 at 20oC. What will be the resistance of the electrode at 85oC. Calculate the resistance of wire 10m long that has a diameter of 2mm and resistivity of 2.63×〖10〗^(-2) Ωm. 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 100A? Calculate the R,P_ε & P_R and P_r. A 10watt resistor has a value of 120Ω. What is the current through the resistor? A resistor of 50Ω has a P.D. of 100V, D.C. across 1 hour. Calculate (a) Power and (b) Energy. Calculate the current through a single loop circuit if ε=120V,R=1000Ω and internal resistance r= 0.01Ω. Find the terminal potential difference of each cell in circuit of figure. The voltmeter in the circuit at the right may be considered to be ideal. Values are ε=15.0V;internal resistance r=5.00Ω; R_1=100Ω; R_2=300Ω. Calculate the current in R_1. Three arms of a Wheatstone Bridge are of 75Ω each. What is the resistance of the fourth arm?