# T. Heddle's Calculations in Fundamental Physics. Electricity and PDF

By T. Heddle

ISBN-10: 0080158315

ISBN-13: 9780080158310

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Additional resources for Calculations in Fundamental Physics. Electricity and Magnetism

Sample text

46 VOL. II. 10. 10Ω. d. of (a) 200 V, and (b) 500 V. d. 11. Apparatus requiring a power supply of 64 W is to be run from a 24 V supply with a suitable series resistor of resistance R. When R = 4 Ω, the power supplied is 36 W. Calculate the correct value of R. 12. f. 50 Ω. 00 Ω. 13. 0 kg of water which is boiled from an initial temperature of 15°C with an efficiency of 75%. Calculate (a) the time taken, and (b) the heat lost to the surroundings. Ref. : water. Solution The heat in joules required to raise the temperature of a body = mc ΔΘ, where m is the mass in kg, c is the specific heat in J kg" 1 deg C"1, and ΔΘ is the rise of temperature in deg C.

Calculate the true resistance of the resistor. 23. Calculate the resistance X and the current it carries in the circuit of Fig. 9, when the meter indicates zero. 24. A bridge circuit has three resistors and a voltmeter connected as a square ABCD: AB = 1000Q;BC= 1000&;CD= 1500Ω; AD is the voltmeter. A battery is connected across the diagonal AC and a tapping key across the diagonal BD. Calculate from first principles the resistance of the voltmeter if its deflection remains unchanged when the tapping key is opened and closed.

D. 11. Apparatus requiring a power supply of 64 W is to be run from a 24 V supply with a suitable series resistor of resistance R. When R = 4 Ω, the power supplied is 36 W. Calculate the correct value of R. 12. f. 50 Ω. 00 Ω. 13. 0 kg of water which is boiled from an initial temperature of 15°C with an efficiency of 75%. Calculate (a) the time taken, and (b) the heat lost to the surroundings. Ref. : water. Solution The heat in joules required to raise the temperature of a body = mc ΔΘ, where m is the mass in kg, c is the specific heat in J kg" 1 deg C"1, and ΔΘ is the rise of temperature in deg C.