When we place a wire carrying an electric current in a magnetic field, what may it experience?
A force
1 of 8
When is the force on the wire in a motor effect at its maximum?
When the wire is perpendicular to the magnetic field
2 of 8
What does the split ring commutator in a motor do?
Reverses the direction of the current every half turn
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Why are the coils on a transformer made from insulated wire?
To prevent current shorting through the core
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What is the core of a transformer made out of?
Iron
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What current is used in a transformer
A.C
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Vp/Vs= (equation for transformer voltage and number of turns)
Np/Ns
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A transformer has 100 turns on the primary coil and 400 on the secondary coil. The p.d across primary coil is 2V. What is the p.d across secondary coil?
8V
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Other cards in this set
Card 2
Front
When is the force on the wire in a motor effect at its maximum?
Back
When the wire is perpendicular to the magnetic field
Card 3
Front
What does the split ring commutator in a motor do?
Back
Card 4
Front
Why are the coils on a transformer made from insulated wire?
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