# Physics revision for quiz

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• Created by: A l e x
• Created on: 18-10-17 06:45
What is a resultant force?
The overall force on a point or object.
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When is an object in equilibrium?
When the combined forces (the resultant force) is zero.
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What is the equation for moments?
force x distance from pivot
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What type of component is a fixed resistor?
Linear, it produces a straight line in its I-V graph.
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What type of component is a diode or a filament lamp?
Non-linear, both produce curves in their I-V graphs.
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What is the motor effect?
It is when a current is placed in magnetic field and so experiences a force. This is becuase two magnetic fields are interacting.
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What is Fleming's left-hand rule?
Helps to find the direction of a force on a current. The index finger is the magnetic field, the middle finger is the current and the thumb is the direction of the force.
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What is magnetic flux density?
It is how many flux (field) lines there are in a region. It shows the strength of the magnetic field (more lines = stronger flux). Symbolised as B and measured in Telsa.
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What is the equation for the size of the motor effect?
Force = magnetic flux density x current x length
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F =...
BIL
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B =...
F/IL
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I =...
F/BL
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L =...
F/BI
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## Other cards in this set

### Card 2

#### Front

When is an object in equilibrium?

#### Back

When the combined forces (the resultant force) is zero.

### Card 3

#### Front

What is the equation for moments?

### Card 4

#### Front

What type of component is a fixed resistor?

### Card 5

#### Front

What type of component is a diode or a filament lamp?