basiconlineengineering.blogspot.com
Basics Concepts Of Engineering: Electricity
http://basiconlineengineering.blogspot.com/2009/07/electricity.html
Basics Concepts Of Engineering. Electricity is the flow of charge around a circuit carrying energy from the battery (or power supply) to components such as lamps and motors. Electricity can flow only if there is a complete circuit from the battery through wires to components and back to the battery again. The diagram shows a simple circuit of a battery, wires, a switch and a lamp. The switch works by breaking the circuit. Resistors connected in Parallel. Voltage and Current is the Effect.
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Basics Concepts Of Engineering: Ohm's Law Calculations
http://basiconlineengineering.blogspot.com/2009/07/ohm-law-calculations.html
Basics Concepts Of Engineering. Use this method to guide you through calculations:. 1- Write down the Values, converting units if necessary. 2- Select the Equation you need (use the VIR triangle). 3- Put the Numbers into the equation and calculate the answer. It should be Very Easy Now! 3 V is applied across a 6 resistor, what is the current? Values: V = 3 V, I =? Equation: I = V/R. Numbers: Current, I = 3/6 = 0.5 A. Values: V = 6 V, I = 60 mA, R =? Equation: R = V/I. Equation: V = I × R.
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Basics Concepts Of Engineering: Resistors connected in Parallel
http://basiconlineengineering.blogspot.com/2009/07/resistors-connected-in-parallel.html
Basics Concepts Of Engineering. Resistors connected in Parallel. When resistors are connected in parallel their combined resistance is less than any of the individual resistances. There is a special equation for the combined resistance of two resistors R1 and R2:. Combined resistance of two resistors in parallel:. R1 × R2. R R1 R2 R3. The simpler equation for two resistors in parallel is much easier to use! Resistors connected in Parallel. Voltage and Current is the Effect. Voltage at zero volts.
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Basics Concepts Of Engineering: Conductors, Semiconductors and Insulators
http://basiconlineengineering.blogspot.com/2009/07/conductors-semiconductors-and.html
Basics Concepts Of Engineering. Conductors, Semiconductors and Insulators. The resistance of an object depends on its shape and the material from which it is made. For a given material, objects with a smaller cross-section or longer length will have a greater resistance. Materials can be divided into three groups:. Conductors which have low resistance. Examples: metals (aluminium, copper, silver etc.) and carbon. Semiconductors which have moderate resistance. Examples: germanium, silicon.
basiconlineengineering.blogspot.com
Basics Concepts Of Engineering: Voltage
http://basiconlineengineering.blogspot.com/2009/07/voltage.html
Basics Concepts Of Engineering. Voltage is a measure of the energy carried by the charge. Strictly: voltage is the "energy per unit charge". The proper name for voltage is potential difference or p.d. for short, but this term is rarely used in electronics. Voltage is supplied by the battery (or power supply). Voltage is used up in components, but not in wires. We say voltage across a component. Voltage is measured in volts, V. Voltage is measured with a voltmeter, connected in parallel.
basiconlineengineering.blogspot.com
Basics Concepts Of Engineering: Current
http://basiconlineengineering.blogspot.com/2009/07/current.html
Basics Concepts Of Engineering. Current is the rate of flow of charge. Current is not used up, what flows into a component must flow out. We say current through a component. Current is measured in amps (amperes), A. Current is measured with an ammeter, connected in series. To connect in series you must break the circuit and put the ammeter acoss the gap, as shown in the diagram. The symbol I is used for current in equations. Why is the letter I used for current? 1mA = 0.001A, or 1000mA = 1A.
basiconlineengineering.blogspot.com
Basics Concepts Of Engineering: Electricity Flows
http://basiconlineengineering.blogspot.com/2009/07/electricity-flows.html
Basics Concepts Of Engineering. We say that electricity flows from the positive terminal of a battery to the negative (-) terminal of the battery. We can imagine particles with positive electric charge flowing in this direction around the circuit, like the red dots in the diagram. This flow of electric charge is called conventional current. This direction of flow is used throughout electronics and it is the one you should remember and use to understand the operation of circuits. Voltage at zero volts.
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Basics Concepts Of Engineering: Voltage & Current is the Effect
http://basiconlineengineering.blogspot.com/2009/07/voltage-current-is-effect.html
Basics Concepts Of Engineering. Voltage and Current is the Effect. Voltage attempts to make a current flow, and current will flow if the circuit is complete. Voltage is sometimes described as the 'push' or 'force' of the electricity, it isn't really a force but this may help you to imagine what is happening. It is possible to have voltage without current, but current cannot flow without voltage. The switch is closed making a complete circuit so current can flow. Voltage but No Current.
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Basics Concepts Of Engineering: The Electron
http://basiconlineengineering.blogspot.com/2009/07/electron.html
Basics Concepts Of Engineering. When electricity was discovered scientists tried many experiments to find out which way the electricity was flowing around circuits, but in those early days they found it was impossible to find the direction of flow. They knew there were two types of electric charge, positive and negative (-), and they decided to say that electricity was a flow of positive charge from to -. They knew this was a guess, but a decision had to be made! Resistors connected in Parallel.
