* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Electricity Notes
Immunity-aware programming wikipedia , lookup
Stepper motor wikipedia , lookup
Spark-gap transmitter wikipedia , lookup
Ground loop (electricity) wikipedia , lookup
Ground (electricity) wikipedia , lookup
Power engineering wikipedia , lookup
Power inverter wikipedia , lookup
Variable-frequency drive wikipedia , lookup
Three-phase electric power wikipedia , lookup
Electrical ballast wikipedia , lookup
History of electric power transmission wikipedia , lookup
Distribution management system wikipedia , lookup
Power electronics wikipedia , lookup
Electrical substation wikipedia , lookup
Current source wikipedia , lookup
Power MOSFET wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Schmitt trigger wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Voltage regulator wikipedia , lookup
Buck converter wikipedia , lookup
Network analysis (electrical circuits) wikipedia , lookup
Alternating current wikipedia , lookup
Stray voltage wikipedia , lookup
Surge protector wikipedia , lookup
Opto-isolator wikipedia , lookup
Electricity 2 Voltage, Potential Difference and Electromotive Force Aims of the Lesson- Voltage Recall the meanings of the phrases ‘potential difference’ and ‘electromotive force’ Recall that in a series circuit the sum of the voltages is equal to the voltage across the whole circuit. Voltage Page 118 - Worksheet on Alexandro Volta (basic notes on voltage) Complete questions 9 and 10 pg 121 Total PD in a circuit Read page 119 and 120 Copy out the statement in the blue box. Complete the Worksheet ‘Understanding Voltage’ Energy Saver Light Bulb Transfers Electrical to Light and Heat - 220 Joules of energy transferred for every coulomb of charge passing through - For a current of 140 mA (0.14 A) - 0.14 Coulombs passing through each second Energy = 220 / 0.14 = 1571 J - Aim of the Lesson Clearly define what is meant by the current and voltage of a circuit! Recall why a voltmeter is placed into a circuit in parallel and an ammeter is placed into a circuit in series Eh… explain that to me please! What does the current flowing a circuit mean? What does the voltage of a component mean? Number of Coulombs For every Coulomb That passes through a component Going past a point every second Amount of Energy transferred Voltmeter action How does a voltmeter go into a circuit? Equipment you need- First of all we need a circuit… What is the Voltmeter measuring? Energy in and energy out, for each coulomb passing through a component Sorry Sir but I’m gonna’ have to search you… What have you got on you, Mr Coulomb? Experiment- Investigating Voltage How does the voltage of a component in a series circuit compare to the voltage of a component in a parallel circuit? The following two circuits are set up and the voltage is measured across both 1.5 V batteries and across each 1.5V bulb individually. Experiment- Investigating Voltage Series Parallel + + V1 Series V1 = V2 = V3 = Parallel V4 = V5 = V6 = Investigating Voltage - Conclusion In a series circuit the voltage supplied by the battery is divided between the components. In a parallel circuit the voltage supplied is the same as the component’s voltage. The energy each coulomb received (from the battery) is equal to the total energy given out as it goes round the circuit (conservation of energy). Voltage in a series circuit If the voltage across the battery is 6V… V …and these bulbs are all identical… …what will the voltage across each bulb be? V V 2V Voltage in a series circuit If the voltage across the battery is 6V… …what will the voltage across two bulbs be? V V 4V Voltage in a parallel circuit If the voltage across the batteries is 4V… What is the voltage here? 4V V And here? V 4V In a SERIES circuit: Summary Current is THE SAME at any point Voltage SPLITS UP over each component In a PARALLEL circuit: Current SPLITS UP down each “strand” Voltage is THE SAME across each”strand” An example question: 6V A3 3A A1 V1 What is the easiest path for the Coulombs of Charge? All bulbs are identical in power rating A2 V2 V3 Advantages of parallel circuits… There are two main reasons why parallel circuits are used more commonly than series circuits: 1) Extra appliances (like bulbs) can be added without affecting the output of the others 2) If one appliance breaks it won’t affect the others either