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Series and parallel circuits

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Presentation on theme: "Series and parallel circuits"— Presentation transcript:

1 Series and parallel circuits
Electrons carry current. Electrons are free to move in metal. Cell Battery Switch Lamp Ammeter Volt meter Store of chemical energy Two or more cells in series Breaks circuit, turning current off Lights when current flows Measures current Measures potential difference Diode LED LDR Fuse Resistor Variable resistor Thermistor Current flows one way Emits light when current flows Resistance low in bright light Melts when current is too high Affects the size of current flowing Allows current to be varied Resistance low at high temp Circuit symbols Series and parallel circuits Series circuit Current is the same in all components. Total p.d. from battery is shared between all the components. Total resistance is the sum of each component’s resistance. Parallel circuit Total current is the sum of each component’s current. p.d. across all components is the same. Total resistance is less than the resistance value of the smallest individual resistor. Series Parallel A circuit with one loop A circuit with two or more loops Current Flow of electrical charge Ampere (A) Potential difference (p.d.) How much electrical work is done by a cell Volts (V) Charge Amount of electricity travelling in a circuit Coulombs (C) Current and Charge Current, potential difference and resistance Total p.d If cells are joined in series, add up individual cell values Charge = Current X time Q = I X t Controlling current Changing current Change the p.d. of the cells Add more components Energy transfers Power (W) = potential difference X current R = V X I AQA Electricity Work is done when charge flowing. Power = (current)2 X resistance P = I2 X R Energy transferred = Power X time E = P X t Ammeter Set up in series with components Voltmeter Set up parallel to components R = V ÷ I Step-up transformers Step-down transformers Increase voltage, decrease current Decrease voltage, increase current Increases efficiency, reduces heat loss. Makes safer for houses. Resistance = Potential difference ÷ Current Domestic uses and safety National Grid Distributes electricity generated in power stations around UK Resistance (Ω) A measurement of how much current flow is reduced The higher the resistance, the more difficult it is for current to flow. Increasing resistance, reduces current. Increasing voltage, increases current. Thermistor LDR Resistance varies with temperature Resistance varies with light intensity Resistance decreases as temperature increases. Resistance decreases as light increases. Alternating current Direct current p.d. switches direction many times a second, current switches direction p.d. remains in one direction, current flows the same direction Generator. Cell or battery. Static electricity PHYSICS only Static electricity Electrical charge is stationary When two insulating material are rubbed together, electrons move from one material to the other. Ohmic conductor At a constant temperature, current is directly proportional to the p.d. across the resistor. Filament lamp As current increases, the resistance increases. The temperature increases as current flows. Diode Current flows when p.d. flows forward. Very high resistance in reverse. ‘Earthing’ a safety device; Earth wire joins the metal case. Mains supply Frequency 50Hz, 230V Current – Potential difference graphs Like charges Repel Unlike charges Attract Shocks Walking on carpet causes friction. Electrons move to the person and charge builds up. When the person touches a metal object, the electrons conduct away, making a spark. 3 pin plug Live - Brown Carries p.d from mains supply. p.d between live and earth = 230V Neutral - Blue Completes the circuit. p.d. = OV Earth – Green and Yellow stripes Only carries current if there is a fault. p.d. = 0V Electric fields Charged objects create electric fields around them. Strongest closest to the object. The field direction is the direction of force on a positive charge. Add more charge increases field strength.

2 Series and parallel circuits
Electrons carry current. Electrons are free to move in metal. Store of chemical energy Two or more cells in series Breaks circuit, turning current off Lights when current flows Measures current Measures potential difference Current flows one way Emits light when current flows Resistance low in bright light Melts when current is too high Affects the size of current flowing Allows current to be varied Resistance low at high temp Circuit symbols Series and parallel circuits Current is the same in all components. Total p.d. from battery is shared between all the components. Total resistance is the sum of each component’s resistance. Total current is the sum of each component’s current. p.d. across all components is the same. Total resistance is less than the resistance value of the smallest individual resistor. A circuit with one loop A circuit with two or more loops Flow of electrical charge Ampere (A) How much electrical work is done by a cell Volts (V) Amount of electricity travelling in a circuit Coulombs (C) Current and Charge Current, potential difference and resistance If cells are joined in series, add up individual cell values Charge = Current X time Q = I X t Controlling current Change the p.d. of the cells Add more components Energy transfers Power (W) = potential difference X current R = V X I AQA Electricity Work is done when charge flowing. Power = (current)2 X resistance P = I2 X R Energy transferred = Power X time E = P X t Set up in series with components Set up parallel to components R = V ÷ I Increase voltage, decrease current Decrease voltage, increase current Increases efficiency, reduces heat loss. Makes safer for houses. Resistance = Potential difference ÷ Current Domestic uses and safety Distributes electricity generated in power stations around UK A measurement of how much current flow is reduced The higher the resistance, the more difficult it is for current to flow. Increasing resistance, reduces current. Increasing voltage, increases current. Resistance varies with temperature Resistance varies with light intensity Resistance decreases as temperature increases. Resistance decreases as light increases. p.d. switches direction many times a second, current switches direction p.d. remains in one direction, current flows the same direction Generator. Cell or battery. Static electricity PHYSICS only Electrical charge is stationary When two insulating material are rubbed together, electrons move from one material to the other. At a constant temperature, current is directly proportional to the p.d. across the resistor. As current increases, the resistance increases. The temperature increases as current flows. Current flows when p.d. flows forward. Very high resistance in reverse. ‘Earthing’ a safety device; Earth wire joins the metal case. Frequency 50Hz, 230V Current – Potential difference graphs Repel Attract Walking on carpet causes friction. Electrons move to the person and charge builds up. When the person touches a metal object, the electrons conduct away, making a spark. 3 pin plug Live - Brown Carries p.d from mains supply. p.d between live and earth = 230V Neutral - Blue Completes the circuit. p.d. = OV Earth – Green and Yellow stripes Only carries current if there is a fault. p.d. = 0V Charged objects create electric fields around them. Strongest closest to the object. The field direction is the direction of force on a positive charge. Add more charge increases field strength.

3 Series and parallel circuits
Electrons carry current. Electrons are free to move in metal. Cell Battery Switch Lamp Ammeter Volt meter Diode LED LDR Fuse Resistor Variable resistor Thermistor Circuit symbols Series and parallel circuits Series circuit Current is Total p.d. Total resistance Parallel circuit Total current p.d. across Series Parallel Current Potential difference (p.d.) Charge Current and Charge Current, potential difference and resistance Total p.d Charge = Current X time Q = I X t Controlling current Changing current Energy transfers Power (W) AQA Electricity Work is done Power = Energy transferred = Ammeter Voltmeter R = V ÷ I Step-up transformers Step-down transformers Resistance = Potential difference ÷ Current Domestic uses and safety National Grid Distributes electricity generated in power stations around UK Resistance (Ω) Thermistor LDR Alternating current Direct current Static electricity PHYSICS only Static electricity Ohmic conductor Filament lamp Diode ‘. Mains supply Current – Potential difference graphs Like charges Unlike charges Shocks 3 pin plug Live - Brown p.d between live and earth Neutral - Blue p.d. = Earth – Green and Yellow stripes Electric fields

4 Series and parallel circuits
Circuit symbols Series and parallel circuits Current and Charge Current, potential difference and resistance Controlling current Energy transfers AQA Electricity . Domestic uses and safety Static electricity PHYSICS only ‘ Current – Potential difference graphs

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