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By Alan Gladwell

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Across which resistor should the multimeter be connected in order to ensure that, as the distance from the light source to the sensor increases, the potential difference recorded increases? 2. In complete darkness, what voltage is recorded on the multimeter? 3. 5m away from the sensor, the voltage on the multimeter increases by 2V. What is the sensitivity of the sensing system when using this light source, in V m-1? 4. When the same light source is placed 0m from the sensor, the potential difference is 0V.

However, since light behaves as both a wave and a particle, we can look at it as both, even if, when doing this, we know that we don't fully understand it yet. The image on the right shows a waveform. This plots the distance through the medium on the x-axis, and the amount of disturbance on the y-axis. The amount of disturbance is known as the amplitude. Wave amplitudes tend to oscillate between two limits, as shown. The distance in the medium between two 'peaks' or 'troughs' (maxima and minima on the waveform) is known as the wavelength of the wave.

4. How much energy is dissipated by a 100Ω resistor in 10 seconds if 2A of current are flowing? 5. 6 x 10-19 C. How long does it take for a mole (6 x 1023 particles) of electrons to flow through a 40W light bulb on a 240V ring main? Resistance and Conductance Conductance is a measure of how well an artefact (such as an electrical component, not a material, such as iron) carries an electric current. Resistance is a measure of how well an artefact resists an electric current. Resistance is measured in Ohms (usually abbreviated using the Greek letter Omega, Ω) and, in formulae, is represented by the letter R.

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