A tungsten filament has a resistance of 133 Ω at 1500C. If the temperature coefficient of resistance at 0 0C of tungsten is 0.0045/C0 , what would be the resistance of the filament at 5000C?

A tungsten filament has a resistance of 133 Ω at 1500C. If the temperature coefficient of resistance at 00C of tungstenis 0.0045/C0, what would be the resistance of the filament at 5000C?

If the 0.130 mm diameter tungsten filament in a light bulb is to have a resistance of 0.230 Ω at 20.0°C, how long should it be?

A person notices a mild shock if the current along a path through the thumb and index finger exceeds 78 µA. Compare the maximum possible voltage without shock across the thumb and index finger with a dry-skin resistance of 3.0 ✕ 105  and a wet-skin resistance of 2000 . dry skin  V wet skin  V

The label on a battery-powered radio recommends the use of a rechargeable nickel-cadmium cell (nicads), although it has a 1.25-V open-circuit voltage, whereas an alkaline cell has a 1.58-V open-circuit voltage. The radio has a 3.2 0 resistance. Hint a. With a nicad cell, having an internal resistance of 0.04 02, what is the voltage supplied to the radio, if a single nicad cell is used? The voltage supplied to the radio is b. With an alkaline cell, having an internal resistance of 0.2 , what is the voltage supplied to the radio, if a single alkaline cell is used? The voltage supplied to the radio is The radio's effective resistance is lowered when its volume is turned up. At what value of radio's resistance does a nicad cell begin to supply a greater voltage to the radio than an alkaline cell? Hint for (c) When the radio has an effective resistance of voltage can be obtained with a nicad cell. V. V. 2 or smaller, a greater

A dry cell with an emf of 1.50V and an internal resistance of 0.050 ohms is "shorted out" with a piece of wire with a resistance of only 0.20 ohms. What will a voltmeter read if it is connected to the terminals of the dry cell at this time?

A person notices a mild shock if the current along a path through the thumb and index finger exceeds 88 µA. Compare the maximum possible voltage without shock across the thumb and index finger with a dry-skin resistance of 3.8 x 10° Q and a wet-skin resistance of 1,900 2. dry skin V wet skin V

A 100-W lightbulb has a resistance of about 12 Ω when cold (20 ∘C) and 124 Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity α=0.0045(C)^−1. Express your answer to two significant figures and include the appropriate units T=