Q1. Explain wattmeter and energy meter.
Wattmeter Energy Meter
Definition It measures the power flows The energy meter measures
in the circuit the energy consume by the
electrical load.
Unit Measures power in watt. Measures energy in joules.
Working Current Carrying conductor Work on the principle of
Principle place in a magnetic field conversion of electrical
experiences a torque. energy into mechanical work.
Construction Fixed and moving coil, Driving system, moving
Control system, damping system, braking system and
system, Scale counting mechanism are the
& pointer. four main parts of the energy
meter.
Applications It is used for measuring It is used for measuring
power in an electrical circuit electrical energy in homes
and for determining the and industries.
power rating of the
appliances.
Q2. Explain CFL lamp.
Ans- CFL stands for compact fluorescent lamp. It is an energy saving lamp that
consumes less power than the old incandescent lamps. It consists of a glass tube
and two electrodes. The glass tube contains mixture of argon gas and mercury vapor
and its inner surface has phosphor coating.
Wattmeter Energy Meter
Definition It measures the power flows The energy meter measures
in the circuit the energy consume by the
electrical load.
Unit Measures power in watt. Measures energy in joules.
Working Current Carrying conductor Work on the principle of
Principle place in a magnetic field conversion of electrical
experiences a torque. energy into mechanical work.
Construction Fixed and moving coil, Driving system, moving
Control system, damping system, braking system and
system, Scale counting mechanism are the
& pointer. four main parts of the energy
meter.
Applications It is used for measuring It is used for measuring
power in an electrical circuit electrical energy in homes
and for determining the and industries.
power rating of the
appliances.
Q2. Explain CFL lamp.
Ans- CFL stands for compact fluorescent lamp. It is an energy saving lamp that
consumes less power than the old incandescent lamps. It consists of a glass tube
and two electrodes. The glass tube contains mixture of argon gas and mercury vapor
and its inner surface has phosphor coating.
