Table of Contents
What is an resistance in physics?
Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). Ohms are named after Georg Simon Ohm (1784-1854), a German physicist who studied the relationship between voltage, current and resistance.
How does resistance affect electric field?
The greater the resistivity, the larger the field needed to produce a given current density. The lower the resistivity, the larger the current density produced by a given electrical field.
What is the relationship between resistance and length of wire?
The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area.
What is current and resistance?
Current is the rate at which charge is flowing. Resistance is a material’s tendency to resist the flow of charge (current).
What is the relation of resistance?
For a given material, resistance and length formula clearly speaks that the resistance is directly proportional to its length. When the length of the material is increased, its value of resistance also increases. When the length of the material decreases, its value of resistance will also decrease.
What is the relation between resistance?
Resistance is directly proportional to length i.e. with an increase in length, resistance increases and with a decrease in length, resistance decreases.
What are two differences between resistance and resistivity?
Also, resistance is an aspect that opposes the flowing of free electrons. In contrast, resistivity is any material’s property that tells the resistance of the material with a particular dimension….Difference between Resistance and Resistivity.
| Parameter | Resistance | Resistivity |
|---|---|---|
| Dependence | Temperature, Length, Cross sectional area of conductor | Temperature |
What are the 2 functions of the resistance?
a resistor is responsible for dissipating power in the form of heat. In electronics, a resistor is often used to control the current. Resistors are needed to prevent short circuits.
Which conductor has more resistance?
Answer: Conductor A has more resistance .
What is the wave-making resistance of a ship?
A simple way of considering wave-making resistance is to look at the hull in relation to bow and stern waves. If the length of a ship is half the length of the waves generated, the resulting wave will be very small due to cancellation, and if the length is the same as the wavelength, the wave will be large due to enhancement.
How does the resistance of a ship depend on its geometry?
Waves generated by a ship are affected by her geometry and speed, and most of the energy given by the ship for making waves is transferred to water through the bow and stern parts. Simply speaking, these two wave systems, i.e., bow and stern waves, interact with each other, and the resulting waves are responsible for the resistance.
What is resistance in physics?
In physics, resistance is a measure of the tendency of a material to resist the flow of an electrical current. It is dependent on the nature of the material, its thickness and length, and on temperature.
What is a carrier wave?
The term originated in radio communication, where the carrier wave creates the waves which carry the information (modulation) through the air from the transmitter to the receiver. The term is also used for an unmodulated emission in the absence of any modulating signal.