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# Download Resistance Ohm*s Law Power

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Transcript

Resistance Ohm’s Law Power Current Circuit Current The current from the 3.0 V battery of a pocket calculator is 0.17 mA. In one hour of operation, (a) how much charge flows in the circuit and (b) how much energy does the battery deliver to the calculator circuit? Ohm’s Law Resistance of a Wire Ohm’s Law The filament in a light bulb is a resistor in the form of a thin piece of wire. The wire becomes hot enough to emit light because of the current in it. A flashlight uses two 1.5 V (effectively a single 3.0 V battery) to provide a current of 0.40 A in the filament. Determine the resistance of the glowing filament Power The heating element of a 110 V, 1500 W heater is 5.4 m long. If it is made of iron, what must its diameter be? In a flashlight, the current is 0.40 A, and the voltage is 3.0 V. Fnd (a) the power delivered to the bulb and (b) the energy dissipated in the bulb in 5.5 minutes of operation.