OCR AAQ in Applied Science: P1 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 漏 = current (A) 脳 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 (惟) = 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) 脳 resistance (惟) * Know Ohm鈥檚 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) 脳 potential difference (V) * Power (W) = (current (A))2 脳 resistance (惟) * Power鈥�(W) = (potential鈥坉ifference (V))2 resistance (惟) * Work done (J) = potential difference (V) 脳 current (A) 脳 time (s) * Work done (J) = potential difference (V) 脳 charge 漏 * 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鈥檚 first law * Know Conservation of energy and Kirchoff鈥檚 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