Electricity & Megnetism
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Coulomb’s law formula with examples and problems
What is Coulomb’s law? “Coulomb’s law states that force of attraction or repulsion between two electric charges is directly proportional to their magnitudes and inversely proportional to the square of the distance between them”.Coulomb’s law examples are given below. Charles…
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What are the Different types of electric motor?
An electric motor is an electromechanical device that converts electrical energy into mechanical energy. Basically, there are three types of electric motor, AC motors ( Synchronous and Asynchronous motors), DC motors ( brushed and brushless ), and Special purpose motors.…
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Resistance in series and parallel circuits
Combinations of resistance in electric circuit There are two possible combinations of resistance in electric circuits: Series combination Parallel combination Series combination In series combinations, resistors are connected end to end and electric current has a single path through the…
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What is difference between Electrostatic force and nuclear force
Electrostatic force Electrostatic force acts between charged particles only. Electrostatic force is a long range force. A proton can interact with all the protons within the nucleus through electrostatic force. Electrostatic force is a weak force. Nuclear force Nuclear force…
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Eddy current: Definition, formula and Applications
What is eddy current? A current is induced in a conductor when subject to a varying magnetic field. Such currents are a source of energy dissipation (eddy current loss) in alternating current machinery. The reaction between the eddy currents in…
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Types of Potentiometer
Different types of potentiometers are provided here. This also includes Applications and Uses of potentiometers. Keep Reading … What is potentiometer? “A potentiometer is a very simple instrument which can measure and compare potential differences accurately”. Potential difference is usually…
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Joules law of heating equation
State Joule’s law of heating “The heat produced in a conductor is: (1) Directly proportion the square of current passing through the conductor,(H ∝ I²) keeping R and t constant; (2) Directly proportion to the resistance of the conductor (H ∝…
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Energy stored in a capacitor equation derivation and problems
Energy stored in a capacitor equation Consider a capacitor with the capacitance ‘C’ , which is connected to the battery of emf ‘V’.If ‘dq’ charge is transferred from one plate to another, then the work done ‘dW’ will be: dW…
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Difference between polar and non polar dielectric materials
Dielectrics are insulating materials through which the electric current cannot pass easily, because these materials have a very high value of electrical resistance. For example, paper, pyrex, polystyrene, transformer oil, pure water, silicon, etc. Types of Dielectric materials There are…
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Ammeter and voltmeter
An ammeter is an electrical device that is used to measure the current. It is the modified form of the galvanometer. It is a low-resistance galvanometer. It is always connected in series with the circuit to measure current. An ideal…