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: Consider the following. (a) Find the current through the resistor in the figure above. (Take R = 9…

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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: 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: 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: he resistance of a copper wire is 0.92 Q at 4°C. The inferred absolute temperature of copper is…

A: The variation of resistance with temprature is  R = Ro ( 1+ t × ∆T) , where T is coefficient of…

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: a current 2A flows in a copper wire over a length of 3 km and 1,1 mm.known copper conductivity is…

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Q: (a) Find the current through the resistor in the figure above. (Take R = 4 Ω.) (b) If the resistor…

A: Given Data  Resistance R = 4Ω Voltage Vba = 12V Increased Temperature Tf =1480C  The Coefficient of…

Q: A 1.70 m cylindrical rod of diameter 0.550 cm is connected to a power supply that maintains a…

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

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Q: Q 8. (a) Show the linearized temperature dependent expression for resistance of thermistor and…

A: Given Nominal resistance R0     = 800 Ω Nominal temperature T0 = 15 + 273 = 288 K Specific…

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 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: energy in kilojoules does the device produce

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Q: A resistor with resistance 28.5 Q is connected to the terminals of a voltage source. (a) Calculate…

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

A: Page 1

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: Given the electric field through a write is 0.50 V/m. The material used to make the wire has…

A: The drift velocity of electrons is the average speed at which electrons move through a conductor…

Q: Only first part

A: Given that-Potential difference, V= 71 VoltCross-sectional area= 3.56×10-6 m2Resistivity, ρ=…

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

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Q: Consider the following. (a) Find the current through the resistor in the figure above. (Take R…

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Q: Calculate the drift velocity of electrons when a current of 1.5 A flows in a copper wire of…

A: Given data:  Current (I) = 1.5 A Cross-sectional area (A) = 5.0 mm2 = 5.0×10-6 m2 Electron density…

Q: 1. a) Find the electrical resistance of a 0.5 cm long, 22-gauge silver wire, if the electrical…

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Q: A ceramic resistor of unknown resistance has a cross-sectional area of 0.753 cm2 and a length of…

A: Write the expression for resistance

Q: A resistor with resistance 31.5 Q is connected to the terminals of a voltage source. (a) Calculate…

A: recall V=IR P=i2R

Q: When initially at 20°C, the power being supplied to a 553 Ohm resistor in a circuit is 7.20 W. Over…

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Q: e resistance of a copper wire is 20 Q. If a voltage of 10 V is a ross the wire, determine the…

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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.