Maths, Physics Revision Physicss Maths Physics Physics A Level Physics Home Maths Maths Revision hut ELECTRICAL CIRCUITS Series In a series circuit the  components are connected one after the other. In this circuit two bulbs are  connected in series. If the  circuit is connected to a  6 volt battery the voltage (potential difference) is  shared by the bulbs Current is not shared, it is the same all the way round a series circuit. (The current through the  2 bulbs is the same) Parallel In a parallel circuit the components (bulbs) are connected parallel to each other on two separarte  branches of the circuit. The voltage across each bulb is the sames as the battery voltage (NOT SHARED) In a parallel circuit the Current is shared  between the rwo bulbs. The voltage is  not shared. Components Diode Allows current to flow in one direction only Resistor Controls the current flowing In the circuit (the higher the resistance  The lower the current) Lamp The resistance of the bulb increases as the temperature of the filament in the lamp increases Variable resistor This is a resistor in which the resistance can be  increased or decreased Light dependent resistor (LDR) The resistance decreases as the light intensity increases Thermistor Resistance decreases as the temperature increases Ammeter Measures the current flowing in The circuit (in amps) Voltmeter Measures the potential difference (voltage) across components in the circuit (in volts) Cell Provides the potential difference (voltage) For the components in  the circuit Battery A battery is a number of cells connected in series. The total potential difference  is the sum of  the pd’s of all the cells in the battery Switch Open, breaks the circuit (stops current flowing Closed, completes the circuit (allows current To flow Fuse Melts if the current goes too high when a  fault occurs. This breaks the circuit and Stops the current from flowing. Protects the  components in the circuit top Click here for components