by yawhuatThe life cycle of the Star/Sun starts from nebulae (consisting of gas and dust). All stars start from a cluster of gas and dust but as gravity pulls all the gas and dust, a protostar will start to form. Protostar The stage where clusters of gas and dust gather and pull together. Temperature increases as […]
by yawhuatConcave and Convex Ray Diagram Understand the concept of a ray diagram in a convex and concave lens. By being able to draw the ray diagram, students can understand the characteristics of the ray. The position of the object will tell whether the image formed (Real/ Virtual, Inverter/Upright and Magnified/Diminished) Ray Diagrams for Convex Lens […]
by yawhuatCalculating Wat in the Electrical Consumption The applications below are used in households. Find the amount of kWh usage for 5 hours. Give your Question 1: How much electrical energy in joules does a 100W lamp transfer in 1-second 5 seconds 1-minute Solution a) 1600 x 1 = 100J b) 100 x 5 = 500J […]
by yawhuatResistor is a device that limits the flow of the current. The most commonly used film resistors can be divided into types according to the materials used: carbon-film, metal-alloy and metal-oxide. Discuss the use of Varistor LDR / Photoresistor Thermistor Varistor Varistor stands for “variable resistor” and is an electronic component. It is used to […]
by yawhuatThe sensitivity of the thermometer is the ability of the thermometer to detect a small change in temperature. Here are some of the factors that influence the sensitivity of glass thermometers Thickness of the glass wall A thicker glass wall reduces the sensitivity of the thermometer Diameter of the capillary tube The smaller diameter of […]
by yawhuatAn electric field is a region of electrical charge. We have two types of charges that create an electric field. Positive charge and negative charge. Positive charge: Field lines are extended outward from the positive charge Negative charge: Field lines are extended inward into the negative charge The diagram above shows the interaction between two […]
by yawhuatSTATIC CHARGE ONLINE IGCSE PHYSICS CLASS Static charges are electrical charges comprised of Positive and Negative charges. Static charges do not move since it resides statically on the insulators. Like charges repel while unlike charges attract each other. How does static charge create? Static charges are produced when two or more objects are in contact […]
by yawhuatCONVEX LENSES There are two types of ray diagrams discussed in IGCSE. Concave Lenses Ray Diagrams Convex Ray Diagrams Looking at the table below, we can understand that there are different applications for convex lenses. Please look at the diagram for a better understanding.
by yawhuatLIGHT REFLECTION: ONLINE IGCSE PHYSICS CLASS Light waves obey the properties of reflection. The diagram above shows the properties of reflection. Lightwave obeys the law of reflection:- The incident ray, normal and reflected ray all lay on the same plane An incident angle equal to the reflected angle List down the application of reflection in […]
by yawhuatSOUND: ONLINE IGCSE PHYSICS CLASS In this chapter, we will be Discovering properties of sound waves We will be investigating the waveform of sound waves, amplitude and frequency We will be talking about echoes Review some questions A sound is a form of a wave. Sound waves are a type of mechanical wave that travels […]