Physics Paper 6C Unit V

1. 1 The device used to convert mechanical energy into electrical energy

• Motor

• Generator

• Transformer

• Indicator

The EMF equation of DC generator is

• e=φNPZ/60

• e=φNPZ/60A

• e=φNP60/ZA

• e=ZA60/φNP

The part of DC motor which converts AC into DC

The working of DC motor / generator can be explained using

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Write the principle of working of DC motor

The pole shoes in DC motor of this shape

The difference between AC generator and DC generator is based on the working of this

• Brushes

• Direction of current

• Commutator

• Magnetic field

The speed of the DC motor depends upon

• Magnetic Field

• Number of Poles

• Number of conductors in armature

• All the three

The speed of the DC motor is measured in

• revolutions per minute

• rotation per minute

• rounds per minute

• revolutions per second

Voltage equation of a DC motor

• E=V-IR

• E=V+IR

• V=E-IR

• V = E +IR