Problem 1: A battery has an emf of 12.8 V and supplies a current of 3.2A. What is the resistance of the circuit? How many coulombs leave the battery in 5 minutes?

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Problem 2: A carbon electrode has a resistance of 0.125  at 20^oC. The temperature coefficient of carbon is -0.0005 at 20^oC. What will be the resistance of electrode at 85^oC?

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Problem 3: Calculate the resistance of wire 10 m long that has a diameter of 2 mm and resistivity 2.63 * 10^-2 Ω m.

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Problem 4:
A typical 12 V automobile battery has a resistance of 0.012 Ω. What is the
terminal voltage of this battery when the starter draws a current of 100 A.
Also calculate R, P, P_R and P_r.

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Problem 5:
A 10 watt resistor has a value of 120 Ω. What is rated current through the
resistor?

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Problem 6: A resistor of 50 Ω has a P.D of 100 V, D.C. across 1 hour. Calculate (a) power and (b) energy.

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Problem 7: Calculate the current through a single loop circuit if ε = 120 V , R = 1000 and internal resistance r = 0.01 ohms.

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Problem 8: Find the current flowing through the resistors of the fig.

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Problem 10: Find the terminal potential difference of each cell in the circuit.

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Problem 11:  The voltmeter in the circuit to the right may be considered to ideal. The values are 15.0 V  , internal resistance r = 5.00 Ω, R₁ = 100 Ω and R₂ = 300 Ω. Calculate the current through R₁.

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Example Numerical Problems from the text

•  Example 12.1: Each second 10¹⁸ electrons flow from right to left across a cross section of wire attached to the two terminals of a battery. (a) Calculate the current in the wire. (b) In which direction the current is flowing? See Solution
• Example 12.2: The high voltage in a TV receiver is 17 KV. The maximum allowable current is 150 micro ampere. What is the least permissible value of load resistance? See Solution