A wire has a resistance of 17.9 2. It is melted down, and from the same volume of metal new wire is made that is 2 times longer than the original wire. What is the resistance of the new wire?

Q: solar cell generates an EMF of 6 V. The terminal potential difference of 5.4 V is measured when a 2…

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Q: A piece of copper wire of resistance R is cut into 3 equal parts. When these three are connected in…

A: Given: The resistance of the copper wire is R. The copper wire cuts into three identical parts.

Q: Three resistors, 28, 46, and 76 Ω, are connected in series, and a 0.49-A current passes through…

A: (a) Since the resistors are connected series, the equivalent resistance is the sum of the given…

Q: A resistor with a 15.0 V potential difference across its ends emits thermal energy at a rate of 327…

A: Let the value of resistance be R ohm . Than power dissipated by the resisitor R with potential…

Q: You measure an object's resistance (with an ohmmeter or multimeter), and get 120 Ω.  Then you…

A: As we can see from diagram the actual resistance of object must be equal to  Resistance in first fig…

Q: The current in the figure below is 0.57 A. (Let the internal resistance of battery 1 be r1 = 1.5 Ω…

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Q: The four resistors in the figure have an equivalent resistance of 12 2. The resistances are as…

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Q: A piece of iron rebar on a construction site measures 2 cm in diameter and is 3m long. What…

A: The resistance can be found using R=LσA Where, σ is electrical conductivity of the material,L is…

Q: A certain copper wire has a resistance of 10.0 ohm (Ω). Show the steps in each question. a) At…

A: Given,The resistance is We know,Resistance is directly depends on length as follows,

Q: You have a LED light bulb that is 6.0 W. You know the potential difference across the light bulb is…

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Q: Two resistances R1 = 10 ΩΩ and R2 = 20 ΩΩ are in parallel. What is the equivalent resistance?

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Q: A battery with terminal voltage ΔV = 2.6 V contains E = 2.6 kJ of energy. It is connected to a P =…

A: The objective of the question is to find the resistance of the light bulb and the time the battery…

Q: A certain wire has a resistance of 76 N. What is the resistance of a second wire, made of the same…

A: The given data are: R1=76 ΩL2=L4D2=D3

Q: Temperatures are often measured with electrical resistance thermometers. Suppose that the resistance…

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Q: A certain wire has a resistance 7 Ω.  What is the resistance of a second wire, made of the same…

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Q: Which of the following statements about resistance for a length of conductor is NOT correct? a. The…

A: Resistance is a property of a conductor that determines the current in the conductor for a given…

Q: A 150 W heating coil (like a light bulb) is designed to operate from 125 V. The coil is made from a…

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Q: . In class we mentioned the idea of internal resistance of a battery. Ideally, for a perfect battery…

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Q: A wire of length L and resistance R is cut into 4 equal pieces. If the 4 pieces are now twisted…

A: Length of the wire is L.Resistance is R.The wire is cut into four equal sizes of length L/4.

Q: A 0.6 m long wire is stretched to 1.7 m long. What is the percentage change in its resistance? The…

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Q: What happens to the resistance of a piece of wire if you double its length and halve its radius?…

A: Resistance of the wire is directly proportional  to the length of the wire and inversly proportional…

Q: A metal wire of resistance 16 Ω and length L is cut into two pieces of equal length. The two pieces…

A: Given: The resistance of the metal wire is 16 Ω. Introduction: Resistance is a measure of the…

Q: A metal wire of resistance R is cut into eight equal pieces that are then placed together side by…

A: The initial resistance of the wire is given as R. Now there can be two ways to solve this question.…

Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.