Relation Between Resistance And Length


For a given material, resistance and length formula clearly speaks that the resistance is directly proportional to its length. When a fuse wire is thick the electrons available are more which is not a suitable characteristic of a fuse wire. Heating effect of current is the working principle for an electric fuse. E) For the making of an electric bulb, tungsten is used. Why is an electric bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb.

A) Write down an expression for the resistance of a metallic wire in terms of the resistivity. It is numerically equal to the resistance between the opposite faces of a cube with sides 1m. B) Presence of impurities in a metal increases the resistance of the material. A) As the temperature decreases, the resistance of the material also decreases. Copper and aluminum wires are used for electricity transmission because they have low resistivities.

Consider the circuit given below where A, B, and C are three identical light bulbs of constant resistance. When a resistance wire is cut into five pieces, the ratio of the resistance and the resultant resistance obtained when the pieces are connected in parallel is 25. V1, V2, and V3 are the potential difference across the 1 Ω, 2 Ω, and 3 Ω resistors in the following diagram, the current is 5A. Will current flow more easily through a thick wire or a thin wire of the same material when connected to the same source? B) Calculate the resistance of a copper wire 1.0km long and 0.50mm diameter if the resistivity of copper is 1.7×10-8Ωm. Among iron and mercury, iron is a better conductor of electricity.

Volt is the unit of electric potential. Is the original resistance, and Ris the resistance after the temperature change. Convert some other form steve quayle website of energy into electrical. The resistance increases as temperature increases. Resistivity of the material of which the conductor is composed.

Resistance is directly proportional to the length. This means that any change in length of the material will change its value of resistance. An electric iron is connected to the mains power supply of 220V. When the electric iron is adjusted at ‘minimum heating’ it consumes a power of 360W but at ‘maximum heating’ it takes a power of 840W. Calculate the current and resistance in each case.

B) Calculate the resistance of an aluminum cable of length 10km and diameter 2.0mm if the resistivity of aluminum is 2.7×10-8Ωm. B) For Ohm’s law to hold good in the given situation, temperature must remain constant. Name the electrical property of a material whose symbol is “omega”.

Explain with the help of a diagram. Volt is a joule per coulomb because joule is a unit of work done while coulomb is a unit for the charge. The ratio of work done to the charge is the definition of potential and volt is the unit of potential difference. Therefore, it can be said that one joule per coulomb is equal to the unit of the potential difference which is also equal to one volt. Diameter, cross-sectional area, and resistance values for different American wire gauge values.

Find answers to questions asked by students like you. A is the area of the circumference of the metal part of the conductor. We know that current is the movement of charge.