Back EMF - Revision history

NRJC: /* About Back emf */

2024-05-22T12:06:40Z

‎About Back emf

NRJC: /* About Back emf */

2024-05-22T12:06:21Z

‎About Back emf

NRJC: /* About Back emf */

2024-05-22T12:05:55Z

‎About Back emf

NRJC: /* About Back emf */

2024-05-22T12:05:38Z

‎About Back emf

NRJC: /* About Back emf */

2024-05-22T09:31:30Z

‎About Back emf

NRJC: /* About Back emf */

2024-05-22T09:30:54Z

‎About Back emf

NRJC: /* About Back emf */

2024-05-22T09:26:19Z

‎About Back emf

NRJC at 08:37, 22 May 2024

2024-05-22T08:37:39Z

NRJC: Created page with "==Key Stage 5== ===Meaning=== Back emf is the electromotive force (emf) induced in the spinning coil of an [..."

2024-05-22T08:37:07Z

Created page with "==Key Stage 5== ===Meaning=== Back emf is the electromotive force (emf) induced in the spinning coil of an [..."

New page

==Key Stage 5==
===Meaning===
[[Back EMF|Back emf]] is the [[Electromotive Force|electromotive force (emf)]] [[Electromagnetic Induction|induced]] in the spinning coil of an [[Motor|electric motor]] or in any coil where the [[Electrical Current|current]] is changing, such as in the [[Primary Coil|primary coil]] of a [[Electrical Transformer|transformer]]. This [[Back EMF|back emf]] acts against the change of applied [[Potential Difference|potential difference (pd)]].

===About Back emf===

*Occurs due to [[Lenz's Law|Lenz's Law]], which states that the direction of the [[Electromagnetic *Induction|induced]] [[Electromotive Force|emf]] is such that it opposes the change causing it.
*In an [[Motor|electric motor]], back [[Electromotive Force|emf]] increases with the [[speed]] of the [[motor]].
*It limits the current flowing through the motor as the [[speed]] increases.
*In [[Electrical Transformers|transformers]], [[Back EMF|back emf]] is [[Electromagnetic *Induction|induced]] in the [[Primary Coil|primary coil]] when the [[Electrical Current|current]] in the [[Secondary Coil|secondary coil]] changes.
*[[Back EMF|Back emf]] is crucial for the functioning of devices like [[motor]]s and [[Electrical Transformer|transformers]] by preventing excessive currents.
*It is a key factor in the design and operation of [[Alternating Current|AC]] and [[D.C. Motor|DC motors]].
===Examples**

*When an [[Motor|electric motor]] starts, the [[Back EMF|back emf]] is initially zero, allowing maximum [[Electrical Current|current]].
*[[Back EMF|Back emf]] in [[Electrical Transformer|transformers]] helps regulate the [[Electrical Current|current]] and [[Potential Difference|voltage]] during operation.

@@ Line 5: / Line 5: @@
 ===About Back emf===
-*[[Back EMF|Back emf]] occurs due to [[Lenz's Law|Lenz's Law]], which states that the direction of the [[Electromagnetic *Induction|induced]] [[Electromotive Force|emf]] is such that it opposes the change causing it.
+*[[Back EMF|Back emf]] occurs due to [[Lenz's Law|Lenz's Law]], which states that the direction of the [[Electromagnetic Induction|induced]] [[Electromotive Force|emf]] is such that it opposes the change causing it.
 *In an [[Motor|electric motor]], [[Back EMF|back emf]] increases with the [[speed]] of the [[motor]].
 *[[Back EMF|Back emf]] limits the current flowing through the [[motor]] as the [[speed]] increases.

@@ Line 7: / Line 7: @@
 *[[Back EMF|Back emf]] occurs due to [[Lenz's Law|Lenz's Law]], which states that the direction of the [[Electromagnetic *Induction|induced]] [[Electromotive Force|emf]] is such that it opposes the change causing it.
 *In an [[Motor|electric motor]], [[Back EMF|back emf]] increases with the [[speed]] of the [[motor]].
-*[[Back EMF|Back emf]] limits the current flowing through the [motor]] as the [[speed]] increases.
+*[[Back EMF|Back emf]] limits the current flowing through the [[motor]] as the [[speed]] increases.
 *In [[Electrical Transformer|transformers]], [[Back EMF|back emf]] is [[Electromagnetic Induction|induced]] in the [[Primary Coil|primary coil]] when the [[Electrical Current|current]] in the [[Secondary Coil|secondary coil]] changes.
 *[[Back EMF|Back emf]] is crucial for the functioning of devices like [[motor]]s and [[Electrical Transformer|transformers]] by preventing excessive currents.

@@ Line 8: / Line 8: @@
 *In an [[Motor|electric motor]], [[Back EMF|back emf]] increases with the [[speed]] of the [[motor]].
 *[[Back EMF|Back emf]] limits the current flowing through the [motor]] as the [[speed]] increases.
-*In [[Electrical Transformer|transformers]], [[Back EMF|back emf]] is [[Electromagnetic *Induction|induced]] in the [[Primary Coil|primary coil]] when the [[Electrical Current|current]] in the [[Secondary Coil|secondary coil]] changes.
+*In [[Electrical Transformer|transformers]], [[Back EMF|back emf]] is [[Electromagnetic Induction|induced]] in the [[Primary Coil|primary coil]] when the [[Electrical Current|current]] in the [[Secondary Coil|secondary coil]] changes.
 *[[Back EMF|Back emf]] is crucial for the functioning of devices like [[motor]]s and [[Electrical Transformer|transformers]] by preventing excessive currents.
 *[[Back EMF|Back emf]] is a key factor in the design and operation of [[Alternating Current|AC]] and [[D.C. Motor|DC motors]].

@@ Line 7: / Line 7: @@
 *[[Back EMF|Back emf]] occurs due to [[Lenz's Law|Lenz's Law]], which states that the direction of the [[Electromagnetic *Induction|induced]] [[Electromotive Force|emf]] is such that it opposes the change causing it.
 *In an [[Motor|electric motor]], [[Back EMF|back emf]] increases with the [[speed]] of the [[motor]].
-*It limits the current flowing through the motor as the [[speed]] increases.
+*[[Back EMF|Back emf]] limits the current flowing through the [motor]] as the [[speed]] increases.
 *In [[Electrical Transformer|transformers]], [[Back EMF|back emf]] is [[Electromagnetic *Induction|induced]] in the [[Primary Coil|primary coil]] when the [[Electrical Current|current]] in the [[Secondary Coil|secondary coil]] changes.
 *[[Back EMF|Back emf]] is crucial for the functioning of devices like [[motor]]s and [[Electrical Transformer|transformers]] by preventing excessive currents.
-*It is a key factor in the design and operation of [[Alternating Current|AC]] and [[D.C. Motor|DC motors]].
+*[[Back EMF|Back emf]] is a key factor in the design and operation of [[Alternating Current|AC]] and [[D.C. Motor|DC motors]].
 ===Examples===

@@ Line 11: / Line 11: @@
 *[[Back EMF|Back emf]] is crucial for the functioning of devices like [[motor]]s and [[Electrical Transformer|transformers]] by preventing excessive currents.
 *It is a key factor in the design and operation of [[Alternating Current|AC]] and [[D.C. Motor|DC motors]].
-===Examples**
+===Examples===
 *When an [[Motor|electric motor]] starts, the [[Back EMF|back emf]] is initially zero, allowing maximum [[Electrical Current|current]].
 *[[Back EMF|Back emf]] in [[Electrical Transformer|transformers]] helps regulate the [[Electrical Current|current]] and [[Potential Difference|voltage]] during operation.