Question

Describe circuits with current, resistors, and emf, and how to solve related problems.

and give examples of circuits, current, resistors, and electromotive force in daily lives.

 

Answer 1

Circuits are of two types, Parallel and series. A good example of parallel circuit would be electrical fitting at our homes. so one faulty appliance won't have any eefect on working of other appliances.

An example of series circuit will be christmas lights as all the bulbs in christmas lights are in series and one faulty bulb will break down the whole circuit.

Current, and resistors can be seen almost every appliance. let's take an example of ceiling fan, we can control its speed by rotating a knob which generally increase the resistance due to which less current will flow through the coils of a fan and fan will rotate slowly.

Electromotive force can be defined as the energy per unit charge causing the charge to move through the circuit also known as voltage. An example of electromotive force would be an electric generator.  They are devices which convert mechanical energy into electrical energy. It induces electromotive force by rotating a coil in the magnetic field. The generators force electric charges to flow through an external electrical circuit.

A ciruit with resistors and voltage source is a simple circuit. If a circuit has more than one resistors either in series or parallel combination, then we can find the equivalent resistance of the circuit. Using ohm's law, we can find the equivalent current in the circuit using equivalent resistance and volatge (emf). Most of these problems can be solved using ohm's law, and kirchoff's law (for circuit with more than one loop)