51ºÚÁÏ

Course: OCR Level 3 Alternative Academic Qualification Cambridge Advanced Nationals in Applied Science.

Topic Area P1: Electricity

• Know the definition of electric current in metals and electrolytes
• Know the unit of current
• Conventional current and electron flow
• Direct current
• Know the unit of charge
• Elementary charge, e, including charge of an electron and proton
• Use of the equation: Charge © = current (A) × time (s)
• Know the definition of potential difference, with respect to work done
• Know the unit of potential difference
• How resistance is defined by: Resistance (Ω) = potential difference (V)
• current (A)
• Know the unit of resistance
• I-V characteristics of resistor, light-dependent resistor (LDR), filament lamp,
• thermistor, diode and light-emitting diode (LED)
• Use of the equation: Potential difference (V) = current (A) × resistance (Ω)
• Know Ohm’s law
• Resistance of NTC thermistors with temperature, and resistance of LDRs with light intensity
• Know the definition of power
• Know the unit of power
• Use of the equations:
  • Power (W) = current (A) × potential difference (V)
  • Power (W) = (current (A))2 × resistance (Ω)
  • Power (W) = (potential difference (V))2 resistance (Ω)
  • Work done (J) = potential difference (V) × current (A) × time (s)
  • Work done (J) = potential difference (V) × charge ©
• The definition of an electronvolt
• Circuit symbols
• The relationships between currents, voltages and resistances in series and parallel, including how potential difference varies for cells in series.
• Know Conservation of charge and Kirchoff’s first law
• Know Conservation of energy and Kirchoff’s second law
• Solving for resistors in series
• Solving for resistors in parallel
• The principles of a potential divider circuit
• The use of a potentiometer as a potential divider
• The use of potential divider circuits with LDRs and thermistors
• How to solve problems for potential divider circuits with potentiometers, LDRs and thermistors
• Use of apparatus, techniques and procedures to investigate potential divider circuits which may include a sensor such as a thermistor or an LDR