9. A current of 2A flows in a wire offering a resistance of 10ohm. Calculate the energy dissipated by the wire in 0.5 hours.
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- What load may be used for an electric range rated at not over 12 kW? (Table 220.55) _____An electric heater having power rated 1000W connected to a 240V supply for 10minutes. a) calculate the conductance of the heater element.b) Find the nett charge flowing in the heater element.c) Calculate the no. of free electron that represent for that amount charge obtained.The resistance of a given device is 46ohms at 25degrees celcius. If the temperature coefficient of resistance of the material is 0.00454 at 20degrees celius, determine the temperature of the device when its resistance is 92ohms.
- Heat energy is often measured in calories and 1 calorie = 4.184 Joule. It is desired to design a heating element to boil a certain amount of water in 2 min requiring 40-kcal heat energy. If the heater is to operate at 110-V, calculate its current and power ratings.The resistance of a coil aluminum wire at 21OC is 210Ω. The temperature of the wire is increased and the resistance rises to 240Ω. If the coefficient of resistance of aluminum is 0 .0039/OC at 21OC, determine the temperature to which the coil has risen.An iron wire has a resistance of 2.78Ω at room temperature of 20ᵒC. when placed near the engine of a vehicle, the resistance raised to 3.614Ω at its new temperature. What is the change in temperature given that the coefficient of temperature for iron at 20 degree Celsius is 0.005?
- A coil of aluminum wire has a resistance of 50Ω when its temperature is 0°C. Determine its resistance, in ohms, at 100°C if the temperature coefficient of resistance of aluminum at 0°C is 0.0038/°C.1.) An incandescent lamp, rated at 100 watts, gives a certain amount of light when placed across the 120V ac power line. Would the amount of light increase, decrease or remain the same, when the lamp is placed across a 120V dc power line? Discuss. 2.) Explain what is meant by effective current and effective voltage.2- A battery supplies a current I to a resistor R with a potential difference E, the percentage uncertainties in E, I and R are known to be identical should the power drawn from the battery W be calculated as E*I or 1*R. Derive an expression of uncertainty in W.
- Show complete solution. Two cities separated by 10,000 ft is connected by telephone wires whose thermal coefficient of resistance at 25oC is 0.003/Co . If the resistance of the wire at 40oC is 611 Ω, what would be its resistance at 25oC?Given:Vb = 100 voltsR = 10000 ohmsC = 200 μFAssuming that after a long period of time, the switch is flipped from position "A" to position "B" at t=0. Determine the current in the source-free circuit after 1 second.During its use, the temperature of the aluminum wire has increased from room temperature to 80 degree Celsius. Calculate the increase in the resistivity of the aluminum wire. The resistivity of the aluminum at room temperature (20 degree C) is 2.75 x 10^(-8) ohm-meter, and the temperature coefficient of resistivity is 0.00039/degree C.
