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

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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