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Answered on 15 Apr Learn Unit IV: Effects of Current
Sadika
Answered on 15 Apr Learn Unit IV: Effects of Current
Sadika
Resistivity is a measure of the resistance of a material to the flow of electric current. It is defined as the resistance of a unit cube of the material measured between opposite faces when the temperature difference between the faces is one degree Celsius.
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Answered on 15 Apr Learn Unit IV: Effects of Current
Sadika
The direction of conventional current is considered to be the direction of flow of positive charge, which is opposite to the direction of the flow of electrons. So, conventional current flows from the positive terminal of a battery or voltage source towards the negative terminal.
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Answered on 15 Apr Learn Unit IV: Effects of Current
Sadika
Answered on 15 Apr Learn Unit IV: Effects of Current
Sadika
Answered on 15 Apr Learn Unit IV: Effects of Current
Sadika
Joule's law states that the heat produced in a resistor is directly proportional to the square of the current passing through it and the resistance of the resistor. Mathematically, H=I²×R, where H is the heat produced, I is the current, and R is the resistance. To find the current, I=P/V and then use Ohm's law to find resistance R=V/I
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Answered on 15 Apr Learn Unit IV: Effects of Current
Sadika
Answered on 15 Apr Learn Magnetic Effects of Electric Current
Sadika
Answered on 15 Apr Learn Magnetic Effects of Electric Current
Sadika
An electromagnet is a type of magnet in which the magnetic field is produced by the flow of electric current. To transform a soft iron piece into an electromagnet, a coil of wire is wound around the iron core, and when electric current passes through the coil, it magnetizes the iron core, creating a temporary magnet.
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Answered on 15 Apr Learn Magnetic Effects of Electric Current
Sadika
Induced current in a circuit can be generated by electromagnetic induction, which occurs when a change in magnetic flux through a closed circuit induces an electromotive force (emf) that causes current to flow. This can be achieved by moving a magnet near a coil of wire or by changing the magnetic field strength through the coil.
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