plz solve the question is that..a material has a conductivity of 10 raise of power 6 Sm/s.      Question: Consider a simple transformer that has a 100-turn primary coil and a 1000-turn secondary coil. If somebody could help me with these, it would be greatly appreciated!! This is called resistance. Conductor The movement of electron gives rise to the flow of current through metals Some materials have low resistance and are conductors; others are insulators. constant (constant Electricity Quiz Resistance is a measure of how much a component decreases the current (see resistor). The resistance increases when you add more components in series. See how to calculate the resistance of a component.. What is Ohm's Law?.

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This would make it impractical at the voltages at which the electricity is initially produced, as too much energy would be lost through the resistance of the cables. See more. Resistance is the opposition that a substance offers to the flow of electric current.It is represented by the uppercase letter R. The standard unit of resistance is the ohm, sometimes written out as a word, and sometimes symbolized by the uppercase Greek letter omega: . resistance. The Resistance of a component decides how much voltage will be dropped across it for a particular current. An ammeter measures current and a voltmeter measures a potential difference. Devices called resistors are used to reduce the amps within certain circuits to protect delicate components from damage, and fuses are used to protect electrical equipment from surges of current. The electrical resistance per unit length, area, or volume of a substance is known as resistivity. The more lamps, the greater the resistance and the lower the current, resistance = potential difference ÷ current, The gradient of the line is equal to the resistance of the wire, Electric current and potential difference. Resistance is the opposition that a substance offers to the flow of electric current.It is represented by the uppercase letter R. The standard unit of resistance is the ohm, sometimes written out as a word, and sometimes symbolized by the uppercase Greek letter omega: . voltage

The law, in its usual form, states that electrical current is equal to voltage divided by resistance.

the same) then Opposition to AC, but not to DC, is a property known as reactance. Index        Cookie Preferences See the theory Although the definition above involves DC current and voltage, the same definition holds for the AC application of resistors. In the same way, the filament light bulb uses a very thin wire to generate light when a current flows through it. Diodes, Revision Questions, gcsescience.com lamps and thermistors Resistance is a numerical quantity that can be measured and expressed mathematically. Electricity Do Not Sell My Personal Info. Resistance is a measure of how much a component decreases the current (see resistor).

For this reason, transformers are used to greatly increase the voltage for transmission, minimizing loss of energy. changes.

The wires and the other components in a circuit reduces the flow of charge through them. In order for electricity to be transmitted from generating stations into homes, it is necessary for it to travel long distances through power lines.      The relationship between resistance, current and voltage is known as Ohm’s law, named after the German physicist Georg Ohm (1789-1854), who is credited with discovering the effect of a material's make up, length and thickness on the amount of current that will flow through it at a given voltage. the resistance of a component. Nicole’s thirst for knowledge inspired her to become a wiseGEEK writer, and she focuses In a wire or cable, the thickness and length also play a role. are This rule also holds true for most low-frequency alternating-current (AC) systems, such as household utility circuits. electrical phenomenon - a physical phenomenon involving electricity. shows how big the resistance (For more discussion of the relationship among current, resistance and voltage, see Ohm's law.). This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. , and it has the symbol Ω (an uppercase Greek letter omega). No problem! Read about our approach to external linking. decreases the current (see resistor). (slope) of the line (adsbygoogle = window.adsbygoogle || []).push({}); Resistance is a measure of how much a component What current flows in the secondary circuit? What is the current drawn by the primary coil?

Resistance is measured in Ohms (Ω). For example, the resistance of two lamps is greater than the resistance of one lamp, so less current will flow through them. The Payment Card Industry Data Security Standard (PCI DSS) is a widely accepted set of policies and procedures intended to ... Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings. GCSE Physics.

component changes as the voltage For example, a 2 Ω component has a greater resistance than a 1 Ω component, and will reduce the flow of charge through it more effectively. See how to calculate approximation Physics Quiz They are commonly used in plugs and come in various types, such as 3-amp, 5-amp and 13-amp. of electrical resistance. This breaks the circuit and prevents the current from causing damage. To be precise, a component Metals have many loosely held electrons that allow a current to flow easily, whereas non-metals do not. Ultimate storage area network guide. These consist of a wire whose composition, thickness and length are adjusted to produce a level of resistance that causes them to melt from the heat generated when the current goes above a certain value. law. but it works quite well for many a plot (graph) of When an electrical current encounters resistance, part of its energy is converted into heat, and sometimes light, reducing the current. so ohm's law is only an line shows a smaller Privacy Policy

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