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Series Circuit – 1 bulb Electric Current 1. Electric Current is the flow of charge 2. Current can be measured using an ammeter (connected in series) 3. Current is measured in Amps (A) 4. Increasing the Voltage will increase the current 5. Increasing the Resistance will decrease the current Current in a Series Circuit Current in a Series Circuit Current in a Series Circuit Current in Series & Parallel Circuits 1. In a series circuit the current is the same everywhere 2. In a parallel circuit the current divides on entering a junction and rejoins on returning to the battery Current in Series & Parallel Circuits Current in a Parallel Circuit Potential Difference 1. Potential Difference is connected to the amount of energy that is gained or lost across part of a circuit 2. Potential Difference is measured using a Voltmeter (connected in parallel) 3. Potential Difference is measured in Volts (V) 4. Potential Difference gained across a cell or battery is called Voltage PD in Series & Parallel Circuits 1. In a series circuit the potential difference is shared between the components 2. In a parallel circuit the potential difference is the same across each component and equals the voltage across the battery Voltage in a Series Circuit Series circuit – 2 bulbs Parallel Circuit Voltage in a Parallel Circuit Resistance 1. Resistance is measured in ohms (Ω) Resistance = Potential Difference ÷ Current 2. In a series circuit the total resistance is equal to the sum of the component resistances Resistance Resistance Current-Voltage Graphs 1. Current-Voltage graphs can be used to show how the current flowing through a component changes with different voltages 2. The current through a resistor is directly proportional to the voltage across the resistor (at a constant temperature) Current-Voltage Graphs Resistance of Components 1. The resistance of a filament lamp increases as the filament gets hotter 2. A diode allows current to flow in one direction only (the diode has a very high resistance in the opposite direction) 3. The resistance of a light dependent resistor decreases with increasing light intensity 4. The resistance of a thermistor decreases with increasing temperature Resistance of Components Resistance of Components Wordsearch Quiz