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Year 11 assessed practical: light intensity Hypothesis * A light bulb gives out light when electricity passes through it * The more volts you add, the more intense the light is. As you double the voltage, the light intensity doubles. * This is because the rays are more concentrated. The rays are twice as concentrated as the intensity doubles, as more power is running through the circuit * The LDR (Light dependent resistor) measures how intense the light is * The LDR frees up electrons, decreasing resistance * The more intense the light is, the lower the resistance in the LDR * Ohms law says that current increase is proportional to potential difference * This only occurs if all conditions are the same * As Potential difference doubles, Current doubles. * Resistance is voltage over current. * If voltage rises proportionally with current, then resistance will halve as voltage doubles. * So as I halve the voltage, the current halves, light intensity halves,...

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