# CHAPTER 2-PHYSICS

• Created by: kekkos
• Created on: 14-11-18 20:33
What is potential Difference? Formula?
The energy transferred per unit charge as charges more between two points in a circuit (measured in volts) FORMULA: V=IR
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What is a thermistor?
A temperature dependant resistor. if the temperature is low then the resistance is high
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What is an LDR?
Light dependant resistor which varies depending on how the light changes
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What is a doide?
A component that only allows a current to flow in one direction
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What is the National grid?
A collection of power cables that connect power to factories and houses.
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How can the National Grids electricity increase?
The higher the current the more energy is wasted and becomes less efficient
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What do step up transformers do?
Increase the potential difference, they are connected between the power situations and the national grid.
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Energy transferred Formula?
Energy Transferred= Change flow x potential difference ( E=QV)
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## Other cards in this set

### Card 2

#### Front

What is a thermistor?

#### Back

A temperature dependant resistor. if the temperature is low then the resistance is high

What is an LDR?

What is a doide?

### Card 5

#### Front

What is the National grid?