Problem 1
Calculate the diameter of a 2.0-cm length of tungsten filament in a small light bulb if its
resistance is 0.050 Q.
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Problem 3
A wire 50.0 m long and 2.00 mm in diameter is connected to a source with a potential
difference of9.11 V, and the current is found to be 36.0 A. Assume a temperature of
20°C and, using Table 17.1, identify the metal of the wire.
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Problem 4
What is the required resistance of an immersion heater that will increase the temperature
of 1.50 kg of water ITom1O.0°Cto 50.0°C in 10.0 min while operating at 120V?
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