GCSE Physics Edexcel P2a Revision
- Created by: Lewis 2001
- Created on: 19-10-16 22:34
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- Physics Revision
- Atomic Structure
- The nucleus is in the center of the atom, containing the protons and neutrons.
- The electrons are in the shells surrounding the atom.
- Charged Particles
- Neutrons have a mass of 1 and a neutral charge of 0.
- Protons have a mass of 1 and charge of +1 (positive)
- Electrons have a mass of 1/200 and a charge of -1 (negative).
- Effect of charged particles
- Ballons can stick to walls by electrons scraping from the clothes to the Balloon.
- A charged Comb can pick up small pieces of paper by transferring the electrons to the comb
- Electrical measurement
- The Ammeter
- Measures the current (in amps) flowing through the compound.
- Must be placed in series (connected in a line with the component)
- The Voltmeter
- Measures the voltage or potential difference (in volts) across the component.
- Must be placed in parallel around the component under test - NOT around the variable resistor or the cell.
- The Ammeter
- Energy Calculations
- Charge = Current x time.
- Potential Difference = current x resistance.
- Speed = Distance/ Time
- Acceleration = Change in velocity/ Time taken .
- Resistance
- Resistance is anything in the circuit which slows the flow down.
- If you increase the voltage - then more resistance will flow.
- If you increase the resistance - then less current will flow.
- Graphs + Data
- Voltage-current Graphs
- Fixed Resistors
- Filament Lamp
- Diode
- Voltage-current Graphs
- Atomic Structure
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