OCR AS level Physics: Energy, Power, and Resistance

OCR AS level Physics presentations for module 4: Energy, Power, and Resistance.

All presentations come with worked examples, solutions and homeworks.

This covers topics from circuit symbols to paying for electricity.

• All circuit symbols required for OCR A level physics
• Polarity of cells and batteries
• Electron flow and conventional current
• Calculating the base SI units for volts
• Comparing potential difference and electromotive force (emf).
• Circuit diagrams for measuring potential difference and emf.
• Calculating energy dissipated in a circuit.
• The structure of an electron gun.
• The electron gun in the history of science (J.J. Thomson).
• Rearranging equations to equate kinetic energy and work done.
• Accelerating potential differences
• Comparing the protons and electrons accelerated in a potential difference
• Definition of an ohm.
• Temperature and resistance for metallic conductors (wires)
• The ohm in base SI units
• I against V graphs and resistance
• I-V Characteristics curves for ohmic components
• I-V Characteristics curves for non-ohmic components
• Circuit diagrams used to measure I and V.
• Describing I-V Characteristics curves
• Polarity of diodes
• Conventional current and diodes
• Plotting I-V curves for diodes
• Describing I-V curves for diodes
• Factors affecting resistance
• Calculating resistivity
• Resistivity and temperature
• Experimentally determining resistivity
• Using a graph to calculate resistivity
• Thermistor uses
• Thermistors with negative temperature coefficients
• Plotting I-V curves for thermistors
• Creating an experiment to test thermistors.
• Materials and uses of LDRs
• Creating an experiment to understand LDRs
• LDRs relationship with light intensity
• Converting time to hours
• Using different units for electrical energy
• Converting from J to kW hr
• Calculating the cost of using different electrical appliances.