 |
| Summary |
|
- Electric potential is the condition that determines the flow of charge. Electrical potential at a point in an electric field is defined as the amount of work done in bringing a unit of positive charge from infinity to that point.
|
| |
- Electrical potential is a scalar quantity.
|
| |
- The potential difference between two points in an electric field is the amount of work done in moving a unit positive charge from one point to the other.
|
| |
- The rate of flow of charges constitutes current.
|
| |
- Ohm's law states that the current flowing through a metallic conductor is directly proportional to the potential difference across its ends, provided temperature and other physical conditions of the conductor remains the same.
|
| |
- When resistors are combined in series the equivalent resistance is the sum of the individual resistance.
|
| |
- When resistors are connected in parallel the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of the individual resistances.
|
| |
- The amount of heat generated in a conductor of resistance 'R', when current 'I' flows through it in a given time 't', is given by I2Rt.
|
| |
- Electric power is said to be one watt if a potential difference of one volt causes a current of one ampere to flow through a conductor.
|
| |
- The magnetic field inside a current carrying solenoid is uniform and parallel to the axis. The magnetic field outside the solenoid is similar to that produced by a bar magnet.
|
| |
- When a current carrying wire is placed in a magnetic field, a force acts on the wire.
|
| |
- An electric motor converts electrical energy into mechanical energy.
|
| |
- When there is a relative motion between a wire loop and a magnet a current is induced in the loop. This is
known as 'electromagnetic induction'.
|
| |
- A dynamo converts mechanical energy into electrical energy.
|
| |
- Heat loss in carrying electricity over a long distance is reduced if it is transmitted at high voltages.
|
| |
- Electric fuses are used to prevent overheating due to overload or short circuiting.
|
| |
- The earth wire is connected to the metallic body of an appliance.
|
| |
