Some ScientificFacts About some object

        Transformer changes the A.C.voltage without change in power     

     The core of the transformer is laminated by the selag  and warnes .

·         The core of the transformer is laminated to reduce the loss of the eddy current.Eddy current are the unwanted current produce in the circuit.

·         The Eddy currents are produce within the core of the transformer and results in the waste or loss of the current .

·         Eddy currents does not cause the spark.

·         IF N_s be the no. of turns of the coil in the secondary coil and N_p be the no of the turns of the primary coil then the turn ratio of the coil becomes,

                                                                      N_s

                               Turn ratio(n)------------

                                                                              N_p

·         Efficiency of the transformer is the ratio of the out put power to the input power and multiplication by 100%

·         There are two types of the transformer,

Step up transformer

Step down transformer

·          In Step down transformer the no. of turns of primary coil and the emf of the primary coil is greater.

·          In Step up transformer  the no. of turns of secondary coil and emf of the secondary coil is greater.

·         In transformer ,if dc is applied to the input output is zero.

·         Dc cannot stepped up  or stepped down by the transformer because its output is zero.

·         Transformer doesn’t amplify the power.

·         Power dissipation in pure inductance and capacitance is zero because the phase difference between the current and voltage is 90⁰.we know that the power dissipation is,

                             P=EIcos90

On solving p=o ,so that the power dissipation is zero.

·         Wattles current is the current which donot produce the any power when passed to the circuit.in this case also power produce in the circuit is,

                                                             P=EIcos90

Because in this case also the phase difference between the current and voltage is 90.so the power is zero.Hence there is no power in the circuit.

·         Choke coil is pure inductive reactance which have high resistance and which is used to control the current in Ac circuit.

·         Self inductance is the measurement of the electrical inertia.

·         Impedence is the ratio of the emf of the circuit to  the frequency of the current in the circuit.

·         Cathode rays are discovered by the sir William crooks.

·         By the use of the discharge tube at low pressure and temperature the cathode rays can be used.

·         Ac voltage cannot be used in the electroplating .

·         In wattles  current the resistance is zero.

·         The ratio of the specific charge of the electron is constant for the cathode rays .

·          Cathode produces the X-ray on striking on the target having high atomic weight and the melting point.

·         MKP ,power  is always lost in the resistor only.

·         Electric current moves with the transfer of the electron in the circuit.