Series Circuit 1 bulb Electric Current 1 Electric

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 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

Current-Voltage Graphs 1. Current-Voltage graphs can be used to show 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

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