Is the resistance of a certain copper wire is 1 ohm then the resistance of a similar Nichrome wire will be about? l/a=R/ρ = 1/(1.68E-8) / meter. ... Therefore, the required resistance of Nichrome wire is 77.381 ohms .
What do you say that the resistance of the wire is 1 ohm?
The resistance of a conductor is said to be 1 ohm if a current of 1 ampere flows through it when the potential difference across it is 1 volt .
What is the resistance of a wire of length 300 m area of cross section 1 mm2 and resistivity 1.0 10 7 ohm m?
Hence, the resistance of the wire comes out to be 30Ω . Hence, option (D) is the correct option.
What is the resistivity of copper wire?
| Material Resistivity, ρ, at 20 °C (Ω·m) Conductivity, σ, at 20 °C (S/m) | Copper 1.68×10 − 8 5.96×10 7 | Annealed copper 1.72×10 − 8 5.80×10 7 | Gold 2.44×10 − 8 4.11×10 7 | Aluminium 2.65×10 − 8 3.77×10 7 |
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What is the resistance of the copper wire in ohms?
| Cross Sectional Area (mm 2 ) Resistance (ohm/km) | Copper Aluminum | 1.0 17.2 26.5 | 1.5 11.5 17.7 | 2.5 6.9 10.6 |
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How many ohms of resistance does 1000 ft No 10 copper wire have?
| AWG wire size (solid) Diameter (inches) Resistance per 1000 ft (ohms) | 16 0.0508 4.016 | 14 0.0640 2.525 | 12 0.0808 1.588 | 10 0.1019 0.999 |
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How many ohms should a good wire have?
How many ohms should a wire have? Typically, good wire connections have a resistance of less than 10 Ω (often only a fraction of an ohm), and isolated conductors offer a resistance of 1 MΩ or greater (typically tens of megohms, depending on humidity).
What is the relation between current I and resistance R?
Ohm’s law defines the relationship between the voltage, current, and resistance in an electric circuit: i = v/r . The current is directly proportional to the voltage and inversely proportional to the resistance.
What do you understand by resistance of a wire?
Resistance is a measure of the opposition to current flow in an electrical circuit . ... All materials resist current flow to some degree. They fall into one of two broad categories: Conductors: Materials that offer very little resistance where electrons can move easily.
What is the effective resistance?
In a complex circuit consisting of two or more resistors, the effective resistance is the measure of the total resistance of all the resistor in the circuit . The resistors can either be connected in parallel combination or series combination.
Which is directly proportional to the resistance?
The resistance of any conductor is directly proportional to length and inversely proportional to area of cross-section of the substance. As value of resistance(R) is directly proportional to length of resistance, so by increasing the length of resistance the value of resistance increases.
Is resistance dependent on geometry?
The resistance of a wire or rod to the flow of electric current depends both on its geometry and its composition . Wires with large cross-sections (thin ones) have small resistance; thick ones have large resistance.
What happened to the resistance as the conductor is made thicker?
The resistance decreases as the conductor is made thicker. The resistance decreases as the conductor is made thicker because resistance is directly proportional to the length of the conductor and inversely proportional to the area of cross-section of the conductor.
Which action would increase the resistance of a copper wire?
Increasing the length of the wire will increase the resistance of the wire.
What material has the highest electrical resistance?
The material that has the highest electrical resistance is silver . After silver copper and gold are the materials that have the highest electrical resistance.
Does copper have high resistance?
Copper has a lower resistivity and is a better conductor of electricity than iron. ... Copper is a better conductor than iron, which means current can flow easier (with less resistance) through copper. This is an inherent property of a material.
