P2 - Electricity PART 1
created 3/12/17
- Created by: amphibology
- Created on: 03-12-17 17:11
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- Q = It
- Coulombs = amps x seconds
- Charge flow (C) = Current (A) x Time (s)
- V = IR
- Resistance (?) = Current (A) x Time (s)
- Ohms = amps x seconds
- Place crocodile clips onto a wire
- 10cm apart
- Record length of wire inbetween
- Close switch
- Record current & p.d.
- Plot a graph - wire length/ resistance
- Straight line
- Through origin
- Directly proportional
- Through origin
- Straight line
- IV CHARACTERISTICS
- Ohmic conductors
- Resistance not affected by current
- so CURRENT directly proportional to P.D.
- Filament lamp
- Electrical charge transfers some energy to thermal energy store
- Resistance increases with temperature
- so curved graph
- Swap wires (reverse current)
- Outdoor lighting
- Burglar detectors
- Thermistor
- Hot conditions
- LOW resistance
- Low temp.
- HIGH resistance
- Car engine temp. sensors
- Electronic thermostats
- COMPONENT can be attached in PARALLEL
- to fixed resistor
- other resistor in SERIES
- SENSING CIRCUITS
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