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How does the heat produced by a current passing through a fixed resistance wire depend on the magnitude of current?
Wiki User
∙ 11y ago
The formula for the heat produced in a wire is P = I2R, where P is the power (the amount of electrical energy wasted, which is the amount of heat produced), I is the current and R is the resistance. In other words, other things being equal, the power is proportional to the square of the current. When transmitting electrical energy over large distances, fairly high voltages are used (typically, several 100 kV), because that way, less current is required, and power losses are reduced.
Wiki User
∙ 11y ago
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How can a magnet field be produced around a wire?
By passing a current threw it.
Why do wires turn hot in a circut?
The current passing through them - since all wires have resistance.
What would happen if the current passing through the coil was too large?
The coil offers some amount of Resistance to the flow of Electric current through the coil. The Resistance of the coil depends on the material used to make the coil and the thickness of the coil wire ( its gauge ) When a current flows through the coil, the voltage drop across the coil and the Power dissipated in the coil both are proportional to the magnitude of current and the coil resistance. Normally the coil is rated to carry certain current and dissipate certain amount of power without causing any damage. If a large magnitude of current flows through the coil beyond its rating , the voltage drop across the coil and the power dissipation in the coil both increase substantially causing over heating of the coil. This can damage the coil and may result in burning of the coil
Is electric circuit also called series circuit?
The 2 simplest Electrical circuits areSeries Circuit - Same amount of current running through loads but voltage various by the resistance of the loadsParallel Circuit - Same voltage on the different loads by subject to the load resistance, the current passing through is different
Why does a wire get hot when an electric current passes through it?
Because the wire has resistance.The power (number of watts) dissipated by any resistance when current passes through it is(the number of amperes of current)2 multiplied by (the number of ohms of resistance).To reduce the power lost from the wire, the choices are:-- reduce the current passing through the wire-- use thicker wire-- keep the wire as cold as possible.(If the wire is made of the right material, and you make it cold enough,then all of its resistance disappears, and it's called a "superconductor".)
In a parallel ac circuit is the current additive?
Yes In parallel circuit , current entering into the circuit will be divided intodifferent paths ( resistances) . Amount of current flow depends upon the magnitude of resistance applied in the circuit. Total current after passing through the circuit will be the sum of all current through each resistance.
How does the heat produce by a current passing through a fixed resistance wire depend on the magnitude of current?
The formula for the heat produced in a wire is P = I2R, where P is the power (the amount of electrical energy wasted, which is the amount of heat produced), I is the current and R is the resistance. In other words, other things being equal, the power is proportional to the square of the current. When transmitting electrical energy over large distances, fairly high voltages are used (typically, several 100 kV), because that way, less current is required, and power losses are reduced.
How can a magnet field be produced around a wire?
By passing a current threw it.
What wires carry current?
A wire with some resistance and a voltage applied to it The amount of current I passing this wire is V/R
What is the cause of resistance and how the resistance and how the resistance of a wire can be determined?
Electrical resistance can be determined by the equation that defines resistance - Ohm's Law. Just divide the voltage across a resistor, by the current passing through it.
Why you cannot measure the resistance of a resistor when there is current passing through it?
you can if you know the current measure the voltage across the resistor E=I*R there is actually no way to measure the resistance without passing current thru it P=I*E E=I*R any 2 will give you the other 2
Why do wires turn hot in a circut?
The current passing through them - since all wires have resistance.
What is the amount of electric energy supplied if the current and voltage are doubled?
Energy is measured in the SI unit Joule. One definition of a Joule is one ampere passing through a resistance of one ohm for one second. Thus doubling the electrical current (amperes/amps) passing through a resistance of one ohm for one second will double the energy. As for voltage, given that voltage (volts) = current (amps) times resistance (ohms) then, assuming a constant resistance, the voltage will double if the current doubles. Thus doubling the voltage (and therefore the current) passing through a resistance of one ohm for one second will double the energy (joules).
What is a ballast resistor?
A ballast resistor is an electrical resistor whose resistance varies with the current passing through it, thus maintaining a constant current.
What is the voltage across the load R when the switch is ON?
It's the product of the resistance of that resistive load and the current passing through it.
What is a carrying wire?
A wire with some resistance and a voltage applied to it The amount of current I passing this wire is V/R
What is a current-carrying wire?
A wire with some resistance and a voltage applied to it The amount of current I passing this wire is V/R
