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Summary: Electricity And Circuits
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Read the summary and the most important questions on Electricity and Circuits
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1 Electricity and Circuits
This is a preview. There are 28 more flashcards available for chapter 1
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How can static charges be built up on insulating materials?
When an insulator is rubbed, electrons are either rubbed off or transferred onto it and it gains a positive or negative charge -
What is the symbol for a variable resistor?
A box with an arrow through it -
What is the symbol for a LED
A triangle with a line going across the tip, there are two arrows going away from the triangle -
What is the symbol for a fuse?
A box with a line through it length-ways -
What is the symbol for a thermistor?
A box with a hockey stick shaped line through it -
What is the symbol for a LDR?
A box in a circle with two arrows pointing towards the box -
What is a LDR and what does it do?
A LDR is a light-dependent resistor, as its surroundings get brighter the resistance becomes lower -
Draw the current-potential difference graph for a bulb
Y-axis is the current, X-axis is the potential difference, line should start levelled off in the bottom left quadrant, line should go through the origin, line should level off in top right quadrant -
Draw the current-potential difference graph for a LED
Y-axis is the current, X-axis is the potential difference, line should be flat along the x-axis until past the origin, line should then curve upwards -
What is a LED and what does it do?
LEDs are more efficient than regular bulbs and last hundreds of times longer but are very expensive. They are used in torches and in some car lights
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