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Internal Resistance All power supplies have some resistance between their terminals This is called internal resistance (r) Internal resistance causes some electrical energy to be transformed...
Edexcel A Level Physics:复习笔记3.15 Electromotive Force
Electromotive Force When charge passes through a power supply such as a battery, it gains electrical energy The electromotive force (e.m.f.) is defined as: The amount of chemical energy converted t...
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Edexcel A Level Physics:复习笔记3.14 Potential Dividers & Variable Resistance
Potential Dividers & Variable Resistance The Potentiometer A potentiometer is a single component which can act as a potential divider. It consists of a coil of wire with a sliding contact A var...
Edexcel A Level Physics:复习笔记3.13 Potential Dividers
Potential Dividers The electrical voltages rule is defined as: The sum of the e.m.f.s in a closed circuit loop is equal to the sum of the potential differences around that loop Therefore, wh...
Edexcel A Level Physics:复习笔记3.12 Potential Difference & Conductor Length
Potential Difference & Conductor Length Potential Difference A cell makes one end of the circuit positive and the other negative. This sets up a potential difference across the circuit The pote...
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9月19日，美国大学理事会College Board 宣布大陆2023年AP考试报名正式开启。在2022-23学年，大学理事会继续与Prometric合作管理国内的AP考试报名和考务工作。 美国大学先修课程(Advanced Placement)，简称AP课程...
Edexcel A Level Physics:复习笔记3.11 Current & Drift Velocity
Calculating Current & Drift Velocity Drift Velocity In a conductor, the current is due to the movement of charge carriers The charge carriers can be negative or positive However current ...
Edexcel A Level Physics:复习笔记3.10 Core Practical 2: Investigating Resistivity
Core Practical 2: Investigating Resistivity Aims of the Experiment The aim of the experiment is to determine the resistivity of a length of wire Variables Independent variable = Length, L, of the w...
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NEC全美经济挑战赛火热报名中，作为为数不多的经济商科方向可选高中国际学术活动，NEC是千万不能错过的高价值学术活动！ NEC全美经济挑战赛介绍 全美经济学挑战赛 (National Economics Challenge) 是美国最具影响...
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