What is a geometric sequence? In a?geometric sequence, there is a?common ratio,?r,?between consecutive terms in the sequence For example, 2, 6, 18, 54, 162, … is a sequence with the rule?‘start at ...
?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...
國(guó)際文憑大學(xué)預(yù)科課程（IBDP）放榜啦！ 據(jù)官網(wǎng)顯示，全球共有173878名學(xué)生在2022年5月的考試中獲得文憑課程（DP）和職業(yè)課程（CP）的成績(jī)。全球共有640位考生獲得滿分45分，跟去年相比少了一半左右。 深圳部分熱...
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 ...
