51ºÚÁÏ

OCR AAQ in Applied Science: P1.1 Electricity

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