What is an arithmetic sequence? In an arithmetic sequence, the difference between consecutive terms in the sequence is constant This constant difference is known as the common difference, d, of th...
国际文凭大学预科课程（IBDP）放榜啦！ 据官网显示，全球共有173878名学生在2022年5月的考试中获得文凭课程（DP）和职业课程（CP）的成绩。全球共有640位考生获得满分45分，跟去年相比少了一半左右。 深圳部分热...
What is a sequence? A sequence is an ordered set of numbers with a rule for finding all of the numbers in the sequence For example 1, 3, 5, 7, 9, … is a sequence with the rule ‘start at one and add...
Temperature & Resistance All solids are made up of vibrating atoms The higher the temperature, the faster these atoms vibrate Electric current is the flow of free electrons in a m...
Resistivity All materials have some resistance to the flow of charge As free electrons move through a metal wire, they collide with ions which get in their way As a result, they transfer som...
What are exponential equations? An exponential equation is an equation where the unknown is a power In simple cases the solution can be spotted without the use of a calculator For example, In more ...
Ohm's Law Ohm’s law states: For a conductor at a constant temperature, the current through it is proportional to the potential difference across it Constant temperature implies constant resi...
Electric Current & Potential Difference Electric Current Electric current is defined as the rate of flow of positive charge carriers It is measured in units of amperes (A) or amps ...
What are the laws of logarithms? Laws of logarithms allow you to simplify and manipulate expressions involving logarithms The laws of logarithms are equivalent to the laws of indices These laws are...
