Problem: In a test to determine the resistance of a single-core cable, an applied voltage   2.5 V was necessary to produce a current of 2A in it at 15° C.   of   (a) Calculate the cable resistance at 55° C if the temperature coefficient of resistance of copper at 0°C is 1/235 per" C.   (b) If the cable under working conditions carries a current of 10A at this temperature, calculate the power dissipated in the cable.

Q: A coil of wire has a cold resistance (20°C) of 0.25 2 and the temperature coefficient is found to be…

A: The resistance of an object depends on its length, area, and an intrinsic property of the material…

Q: A common flashlight bulb is rated at 0.28 A and 2.7 V (the values of the current and voltage under…

A: We know, T=T0+1αRR0-1 where, T0 is the room temperature  α is the coefficient of resistivity R is…

Q: (25%) Problem 6: A copper wire has a resistance of 0.495 at 20.0°C, and an iron wire has a…

A: Let at temperature T  Riron = Rcu  .535[1+5×10^-3(T-20)] = .495 [1+3.9×10^-3(T-20)]…

Q: The resistance of a copper wire at 7⁰C is 50 mΩ. If the temperature coefficient of copper at 0⁰C is…

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Q: A toaster has a Nichrome (a-4.5 10 C) heating element that has a resistance of Ro 80 at a…

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Q: When initially at 25 C, the power being supplied to a 555 Ohm resistor in a circuit is 7.5 W. Over…

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Q: The current through the battery and resistors 1 and 2 in Figure (a) is 2.90 A. Energy is transferred…

A: Current through the battery and resistors: I = 2.90 A Thermal energy dissipated by resistor 1:…

Q: An advanced lab student is studying the effect of temperature on the resistance of a current…

A: The solution is attached below. i= 3.404AExplanation:

Q: A coil of nichrome wire of resistivity p=10-6 N.m is used as a heating element in a water evaporator…

A: To find the length of the wire, we need to consider the power dissipated in the wire and use it to…

Q: A wire 3.00 m long and 0.450 mm2 in cross-sectional area has a resistance of 38.8 Q at 20.0°C. If…

A: Find the temperature coefficient of resistivity. R=R01+αT-T0RR0=1+αT-T0RR0-1=αT-T0α=RR0-1T-T0

Q: A 17-V storage battery delivers current at the rate of 55 A. In a 26-min period, the heat lost from…

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Q: A resistor is attached in a simple circuit (see Figure below) to an ideal battery that has AV = 10…

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Q: 13-V storage battery delivers current at the rate of 59 A. In a 25 min period, the heat lost from…

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Q: n electronic device designed to operate at any temperature in the range from -17.6°C to 57.9°C…

A: The relation between resistance and temperature is given by:- ∆R= Rα∆T Where; ∆R= change in…

Q: A bullet of mass mb is fired horizontally with speed vi at a wooden block of mass mw resting on a…

A: Part A The bullet gets completely embedded into the block. So, the collision is completely…

Q: Calculate vo in the circuit in the following figure: 0.5 H 10 10 cos (10r +75°) v(1) = 7.071 cos(10f…

A: Given Find the output voltage in the circuit, as following below.

Q: A heating element has a temperature coefficient = 0.005 °C-1 is operated at a constant voltage Vo At…

A: Given that temperature coefficient of heating element and initial and final value of current and…

Q: A large TV works properly under the voltage of 110 V with power P = 1940 W. (a)  Calculate the…

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Q: A nichrome wire and an aluminum wire, each with the same initial resistance, have the same change in…

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Q: A resistance oven employing nichrome wire is to be operated from 230 V single phase supply and is to…

A: Let P be defined as the power output, V be defined as the supply voltage. Let T1 and T2 be defined…

Q: An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W…

A: Write the expression for power output. When heating at maximum rate. Use equation (I) to find the…

Q: A thin silver wire has a resistance of 0.5 ohms when its temperature(in K) is To. The wire is then…

A: Temperature coefficient of silver = 0.0038 °C-1

Q: A 22-V storage battery delivers current at the rate of 48 A. In a 34-min period, the heat lost from…

A: Voltage (V) = 22 volts Current (I) = 48 A Time (t) = 34 min Heat lost from the battery = 104 kJ

Q: A wire is made from a material having a temperature coefficient of resistivity of 0.00125 (°C)". In…

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Q: An engineering intern is studying the effect of temperature on the resistance of a current carrying…

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Q: A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2 A which…

A: Initial current,

Q: (a) In the figure what value must R have if the current in the circuit is to be 1.3 mA? Take ɛ1 =…

A:

Q: A typical flash bulb is rated at 310 mA and 2.90 V, the respective values of current and voltage…

A: Page 1

Q: •21 ILW A common flashlight bulb is rated at 0.30 A and 2.9 V (the values of the current and voltage…

A: Operating resistance of the bulb is R=VI=2.9 V0.3 A=9.67Ω

Q: An iron wire with a diameter of 2 mm will be used to connect a voltage source to a 100 kΩ resistor.…

A: Power loss in the resistor: The power loss in the resistor is given by the formula, P=i2R…

Q: In the balanced condition, the values of the resistances of the four arms of a Wheatstone bridge are…

A: Wheatstone bridge is an electrical circuit it is used to measure unknown electrical resistance by…

Q: A 60-cm-long heating wire is connected to a 120 V outlet. If the wire dissipates 45 W, what are (a)…

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Q: When a 200 ohm resistor, a 300 microfarad capacitor (uF) that's initially uncharged, and a 6-volt…

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Q: An electron's de Broglie wavelength is 4.8 µm (me= 9.11 x 10-31 kg). What is its speed? (1 µm = 10-6…

A: De broglie wavelength =h/p

Q: A certain material has a resistance of 5 2 at 20°C. The material is then heated to 800°C, calculate…

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Q: A 50-ohm resistor is initially at 30 degrees Celsius. Find its resistance when the temperature…

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.