Current Electricity Additional Physics

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  • Created by: Sophie
  • Created on: 07-04-15 10:27
What is a build up of static caused by?
Friction
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What happens when a polythene rod is rubbed against a cloth?
The electrons from the cloth move to the rod, leaving the rod with an overall negative charge
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What happens when an acetate rod is rubbed against a cloth?
Electrons move from the rod to the cloth, leaving the rod with an overall positive charge
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What happens when two oppositely charged objects are placed next to each other?
They attract
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If there is a big distance between two like charged objects, what does it mean?
The force of the objects repelling each other is very strong
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What is current?
Current is the flow of electrical charge around a circuit
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What is potential difference?
The work done per coulomb of charge that passes between two points in a circuit
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Why does resistance increase with temperature?
When charge flows, some of the electrical energy is transferred to heat energy, causing the ions in the conductor to vibrate more. These vibrations make it very difficult for a current to flow
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Why does the filament lamp graph level off at high temperatures?
When more current flows, the temperature increases and thus the resistance increases, so the current decreases again
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What is potential difference across a component?
The energy transferred by that component per coulomb
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In a series circuit, potential difference is...
Shared between various componenets
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In a series circuit, current...
Is the same everywhere and is determined by pd and resistance
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In a series circuit, resistance...
Adds up
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In parallel circuits, each component is...
Separately connected to the positive and negative of the supply
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In parallel circuits, potential difference...
Is the same across all components
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In parallel circuits, current is...
Shared between branches. Current going into a branch = current leaving
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Other cards in this set

Card 2

Front

What happens when a polythene rod is rubbed against a cloth?

Back

The electrons from the cloth move to the rod, leaving the rod with an overall negative charge

Card 3

Front

What happens when an acetate rod is rubbed against a cloth?

Back

Preview of the front of card 3

Card 4

Front

What happens when two oppositely charged objects are placed next to each other?

Back

Preview of the front of card 4

Card 5

Front

If there is a big distance between two like charged objects, what does it mean?

Back

Preview of the front of card 5
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