What Is The Difference Between Static Electricity And .
What is the difference between staticelectricity and current electricity?Static electricity is stationary or collects on the surface ofan object, whereas current electricity is flowing veryrapidly through a conductor.The flow of electricity in current electricity has electricalpressure or voltage. Electric charges flow from an areaof high voltage to an area of low voltage.http://sciencelessons.weebly.com
The pressure of the water flowing throughthe pipes on the last slide compare to thevoltage (electric potential) flowing throughthe wires of the circuit. The unit used tomeasure voltage is volts (V).The flow of charges in a circuit is calledcurrent. Current (I) is measured in Amperes(A).
What are electric circuits?Circuits typically contain a voltage source, a wireconductor, and one or more devices which use theelectrical energy.What is a series circuit?A series circuit is one which provides a single pathwayfor the current to flow. If the circuit breaks, all devicesusing the circuit will fail.
What is a parallel circuit?A parallel circuit has multiple pathways for the current toflow. If the circuit is broken the current may pass throughother pathways and other devices will continue to work.
What is the difference between an open circuit and aclosed circuit?A closed circuit is one in which the pathway of the electricalcurrent is complete and unbroken.An open circuit is one in which the pathway of the electricalcurrent is broken. A switch is a device in the circuit in which thecircuit can be closed (turned on) or open (turned off).
circuit diagramScientists usually draw electric circuits using symbols;1 batterylampswitchwires
Simple Circuits Series circuit– All in a row– 1 path for electricity– 1 light goes out andthe circuit is broken Parallel circuit– Many paths forelectricity– 1 light goes out andthe others stay on
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PARALLEL CIRCUIT Place two bulbs in parallel. What do younotice about the brightness of the bulbs? Add a third light bulb in the circuit. Whatdo you notice about the brightness of thebulbs? Remove the middle bulb from the circuit.What happened?
Complete circuit For the bulb to light up, the current mustbe able to flow from the battery to the bulb,the back again to the battery. Electricitywill only flow when there is a completecircuit, with a pathway leading back to itssource.
Voltage: Energy in the circuit Electrons carry potential energy around a circuit.The energy is supplied from the mains supplythrough the power pack or battery, and used bycomponents such as bulbs which convertselectrical energy to light energy. The energy supplied by a power source or usedby a component is measured in volts(V) by avoltmeter which must be connected in parallel ina circuit. A voltmeter measures the ‘potential difference’between the 2 points in the circuit it is connectedto.
Current: Ampere (A) The stream of electrons flowing around acircuit is the current. Current is measuredin amperes ( Amps) by an ammeter,which must be connected in series in acircuit. Ammeter measure the size of the current.
Ohm’s LawI V/R I Current (Amperes)(amps) V Voltage (Volts) R Resistance (ohms)Georg Simon Ohm (1787-1854)
OHM’s LAW Measure the current and voltage across each circuit. Use Ohm’s Law to compute resistance.Series CircuitVoltageCurrentResistanceParallel CircuitVoltageCurrentResistance
How you shouldbe thinking aboutelectric circuits:Voltage: a force thatpushes the currentthrough the circuit.
How you shouldbe thinking aboutelectric circuits:Resistance: frictionthat impedes flow ofcurrent through thecircuit.
How you shouldbe thinking aboutelectric circuits:Current: theelectrons flowingthrough the wires ofthe circuit.
measuring currentElectric current is measured in amps(A) using an ammeter connected inseries in the circuit.A
measuring currentThis is how we draw an ammeter in a circuit.AASERIES CIRCUITPARALLEL CIRCUIT
measuring currentSERIES CIRCUIT current is the sameat all points in thecircuit.2A2A2APARALLEL CIRCUIT current is sharedbetween thecomponents2A2A1A1A
copy the following circuits and fill in themissing ammeter readings.3A?4A?3A1A?4A?4A1A1A?
fill in the missing ammeter readings.3A?4A?3A1A?4A?4A1A1A?
measuring voltageThe ‘electrical push’ which the cell gives tothe current is called the voltage. It ismeasured in volts (V) on a voltmeterV
measuring voltageThis is how we draw a voltmeter in a circuit.VSERIES CIRCUITVPARALLEL CIRCUIT
The circuit is no longer complete,therefore current can not flowThe voltage decreases because the currentis decreased and the resistance increases.
The current remains the same. The totalresistance drops in a parallel circuit as morebulbs are addedThe current increases.
Series and Parallel Circuits Series Circuits– only one end of each component is connected– e.g. Christmas tree lights Parallel Circuits– both ends of a component are connected– e.g. household lighting
measuring voltageDifferent cells produce different voltages.The bigger the voltage supplied by the cell,the bigger the current.Unlike an ammeter, a voltmeter isconnected across the componentsUsually use the term PotentialDifference (pd) when we talk aboutvoltage.
measuring voltageVVVV
series circuit voltage is shared between thecomponents3V1.5V1.5V
parallel circuit voltage is the same in all parts of the circuit.3V3V3V
measuring current & voltagecopy the following circuits on the next twoslides.complete the missing current and voltagereadings.remember the rules for current and voltagein series and parallel circuits.
measuring current & voltagea)6V4A?A?V?V?A
measuring current & voltageb)4A6V?A?V?A?V?A
answersa)b)4A6V6V4A6V4A4A3V2A3V4A6V2A
Voltage, Current and Power 1 V is 1 Joule per Coulomb (J/C)1 A of current 1 Coulomb per second1C 6.24 x1018 electrons/secondIf I have one volt (J/C) and one amp (C/s), thenmultiplying gives Joules per second (J/s)– this is power: J/s Watts So the formula for electrical power is just:P VI: power voltage current More work is done per unit time the higher thevoltage and/or the higher the current
P VI: power voltagecurrentThe total amount of energysupplied by a battery or power packdepends on the number ofelectrons passing each second(current) and the amount ofelectrical energy supplied to theelectrons (voltage gain).
P VI: power voltagecurrentThe total amount of energy gained orused per second by a component iscalled its power. Power, symbol P, ismeasured in units called watts, symbolW.One watt is one joule of energy gained orused per second. A 100 watt light bulb uses100 joules of electrical energy each second.
The resistance, symbol R, of acomponent is measured inunits called ohms, symbol Ω.
Resistance Some components are made of materialswhich are difficult for electrons to travelthrough. This property is calledresistance. Increasing the resistance in a circuitdecreases the number of electrons thatflow through – it reduces the current.Decreasing the resistance in a circuitallows more current to flow.
A fuse is a thin wire thatmelts and breaks a circuit ifthe current gets too large.
What is the difference between static electricity and current electricity? Static electricity is stationary or collects on the surface of an object, whereas current electricity is flowing very rapidly through a conductor. The flow of electricity in current electricity has electrical pressure or voltage. Electric charges flow from an areaFile Size: 767KB
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Le genou de Lucy. Odile Jacob. 1999. Coppens Y. Pré-textes. L’homme préhistorique en morceaux. Eds Odile Jacob. 2011. Costentin J., Delaveau P. Café, thé, chocolat, les bons effets sur le cerveau et pour le corps. Editions Odile Jacob. 2010. 3 Crawford M., Marsh D. The driving force : food in human evolution and the future.
