Edexcel A Level Physics:复习笔记3.7 Electrical Power
Electrical Power Work is also defined as a transfer of energy When components transfer electrical energy to other stores, work must be done because energy is transferred Therefore, potential differ...
Edexcel A Level Physics:复习笔记3.6 Resistance in Series & Parallel
Deriving Equations for Resistance in Series & Parallel Resistors In Series When two or more components are connected in series: The combined resistance of the components is equal to the sum of ...
Edexcel A Level Physics:复习笔记3.5 Energy Conservation in Circuits
Energy Conservation in Circuits The Electrical Voltages Rule (Kirchhoff's Second Law) Energy is never used up or lost in a circuit, since everything follows the Law of Conservation of Energy The el...
Edexcel A Level Physics:复习笔记3.4 Charge Conservation in Circuits
Charge Conservation in Circuits The Electric Current Rule (Kirchhoff's First Law) The electric current rule is defined as: The algebraic sum of the currents entering and leaving a junction is equal...
Edexcel A Level Physics:复习笔记3.3 Ohm's Law
Defining Resistance Resistance Resistance is defined as the opposition to current It is further defined by Ohm's Law, which says that the resistance of a conductor is given by the ratio of p...
Edexcel A Level Physics:复习笔记3.2 Potential Difference
Potential Difference Potential Difference A cell makes one end of the circuit positive and the other negative This sets up a potential difference across the circuit This is sometimes known as the v...
Edexcel A Level Physics:复习笔记3.1 Electric Current
Electric Current Electric Current Electric current is defined as: The rate of flow of charge It is measured in units of amperes (A) or amps The charge, current and time are related by the equation:...
Edexcel A Level Physics:复习笔记2.22 Efficiency
Efficiency The efficiency of a system is a measure of how well energy is transferred in a system Efficiency is defined as: The ratio of the useful power or energy transfer output from a syst...
Edexcel A Level Physics:复习笔记2.21 Power
Power The power of a mechanical process is the rate at which energy is transferred Since work done is equal to the energy transferred, power can also be defined as the rate of doing work or the wor...
