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Learn: The Motor Effect
AQA GCSE Combined Science specification.
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Welcome!Today we'll learn about the motor effect. This is an essential topic in GCSE Physics, helping us understand how forces are created in electric motors. Let's break it down step by step!
What is the Motor Effect?The motor effect occurs when a current-carrying wire is placed in a magnetic field, producing a force. This happens because the magnetic field of the wire interacts with the external magnetic field.
How Does It Work?The magnetic field around the wire interacts with the external magnetic field, causing a force to act on the wire. The direction of the force is determined by the left-hand rule, which links the direction of current, magnetic field, and force.
Quick check: What causes the force in the motor effect?
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Using the Left-Hand RuleThe left-hand rule helps us predict the direction of the force. Align your thumb, first finger, and second finger at right angles to each other:Thumb = direction of forceFirst finger = direction of external magnetic fieldSecond finger = direction of current
The {{blank0}} predicts the direction of force in the motor effect. The thumb represents {{blank1}}.
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Factors Affecting the Motor EffectSeveral factors influence the size of the force:The current in the wire: A larger current produces a stronger force.The strength of the magnetic field: A stronger field increases the force.The angle between the wire and field: The force is maximum when the wire is perpendicular to the field.
Match the items on the left with their correct pairs on the right
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Review Time!Great work! You've learned about the motor effect, left-hand rule, and factors affecting the force. Now let's test your understanding with a few questions.
Which factors affect the size of the force in the motor effect? (Select all that apply)
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What happens when the wire is parallel to the magnetic field?
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Match the items on the left with their correct pairs on the right
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