Switches SPDT Reed switch Relays Circuit symbols Simple circuits A normal switch is often called a SPST (or Single Pole Single Throw) switch Symbol for a SPST (Single Pole Single Throw) switch: Switch OPEN………. current cannot flow … Continue reading →
Every measurement has to have a value and a unit. The value is the number you have measured The unit shows us what you have been measuring Quantity Unit Method of measurement Distance Metre (m) Centimetre(cm) Use a metre … Continue reading →
The Sun is at the centre of the solar system and provides all our energy, The Earth is a planet in orbit around the Sun (path of the orbit shown by the blue line). The Moon is a satellite in … Continue reading →
Magnetism If a substance is attracted to a magnet it is said to be magnetic. A magnetic substance must contain iron, cobalt or nickel. Magnets have two poles. The north seeking pole (N) and the south seeking pole (S). The … Continue reading →
Ammeters and current Circuit Symbols Switches Whenever an electric current flows when we must have a complete circuit. The components in a circuit are represented by symbols The battery (or cells) push the electricity around the circuit. The wires … Continue reading →
Energy is needed to any useful job of work. This means if something is capable of helping you do some work it must have energy eg a wound up spring or a piece of coal coal. Energy is measured in … Continue reading →
Light and sound are made of WAVES. They are both forms of ENERGY. Light travels much faster than sound. This is why the flash of lightening is seen long before the sound of thunder is heard, even though they are … Continue reading →
Pressure is defined as force per unit area. The pressure exerted by a force tells us concentrated the force is . Pressure is calculated as : PRESSURE = FORCE ÷ AREA The UNITS of pressure we use are newtons per … Continue reading →
A force is any kind of PUSH or PULL. The unit of force is the newton (N). A force can be measured using an instrument called a force meter (sometimes called a newton meter or spring balance) Using a force … Continue reading →
Table of units of measurement There are three fundamental units of measurement: MASS DISTANCE TIME Mass The mass of an object tells us how heavy it is. Mass is measured in kilograms (kg) or in grams (g) (This means that … Continue reading →
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