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If a certain silver wire has a resistance of 8.10 Ω at 19.0°C, what resistance will it have at 56.0°C?
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- Power P0 = I0 V0 is delivered to a resistor of resistance R0. If the resistance is doubled (Rnew = 2R0) while the voltage is adjusted such that the current is constant, what are the ratios (a) Pnew/P0 and (b) Vnew/V0? If, instead, the resistance is held constant while Pnew = 2P0, what are the ratios (c) Vnew/V0, and (d) Inew/I0?A metal wire has a resistance of 10.0 l at a temperature of 20.0 ° C . If the same wire has a resistance of 10.6 lat 90.0 ° C , what is the resistance of this wire when its temperature is 220.0 ° C ?A metal wire has a resistance of 10.00 W at a temperature of 20°C. If the same wire has a resistance of 10.55 W at 90°C, what is the resistance when its temperature is -20°C? 0.70 W 9.69 W 10.31 W О 13.8 W
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- A given copper wire has a resistance of 5.08 Q at 20.0°C while a tungsten wire of the same diameter has a resistance of 4.71 Q at 20.0°C. At what temperature will the two wires have the same resistance? °C Need Help? Read ItA battery has an emf of 10.0 V with an internal resistance of 0.0400 Ω. Its terminals are connected to a network of resistors with equivalent resistance of 2.00 Ω. What is the power delivered to the network? 49.0 W 47.0 W 50.0 W 48.0 WIf the 0.145 mm diameter tungsten filament in a light bulb is to have a resistance of 0.185 Ω at 20.0°C, how long should it be? The resistivity of tungsten at 20.0°C is 5.60 10-8 Ω · m
- A cell phone operates on a V = 3.61 V battery. If the resistance within the circuitry of the phone is R = 15.4 Ω, what power does it consume? Your answer should be in watts (W).An extension cord has a resistivity of p = 7.5 x 10-8 Ω.m. The cord is made from copper wire with a diameter D = 0.45 cm and it is L = 9.9 m long. (a) What is the resistance in ohms? R = (b) If a current of I= 2.95 A passes through the wire what voltage is the cord connected to, in volts? V=At 20°C, the carbon resistor in an electric circuit connected to a 5.7-V battery has a resistance of 2.7 ✕ 102 Ω. What is the current in the circuit when the temperature of the carbon rises to 90°C? give answer in mA