Edexcel IGCSE Biology: Double Science 復習筆記 1.1.5 Living Organisms: Movement & Control Movement Movement is an?action by an organism?causing a?change of position or place The m...
Circuit Symbols The diagrams below show the various circuit symbols that could be used in circuit diagrams. You will be expected to recognise and draw all of these The most common symbols are as fo...
Edexcel IGCSE Biology: Double Science 復習筆記 1.1.4 Living Organisms: Response to Surroundings Response to Surroundings The sensitivity?of an organism refers to its ability to detect...
Edexcel IGCSE Biology: Double Science 復習筆記 1.1.3 Living Organisms: Excretion Excretion Chemical reactions?that take place inside living cells are described as?metabolic reactions ...
Edexcel IGCSE Biology: Double Science 復習筆記 1.1.2 Living Organisms: Nutrition & Respiration Nutrition Organisms must obtain food to provide?energy Energy is necessary to carry out life proce...
Resistance in a Light-Dependent Resistor A light-dependent resistor (LDR) is a non-ohmic conductor and sensory resistor Its resistance automatically changes depending on the light energy falling on...
Edexcel IGCSE Biology: Double Science 復習筆記 1.1.1 The Unifying Characteristics of Living Organisms The Unifying Characteristics of Living Organisms In order for something to be considered...
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?some, or a...
Resistance in a Filament Lamp The?I-V?graph for a filament lamp shows the current increasing at a proportionally slower rate than the potential difference I-V characteristics for a filament lamp Th...
I–V Characteristics As the potential difference (voltage) across a component is increased, the current also increases (by Ohm’s law) The precise relationship between voltage and current is differen...
Ohm's Law Ohm’s law states that for a conductor at a constant temperature, the?current?through it is?proportional?to the?potential difference?across it Constant temperature implies constant resista...
Defining Resistance Resistance is defined as the?opposition?to current For a given potential difference:?The higher the resistance the lower the current Wires are often made from copper because cop...
