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# Physics OCR

TermDefinition
Coulomb One coulomb is the amount of charge which flows past a point in a circuit in a time of 1 seconds when current is 1 A
Kirchhoff's First Law The sum of the currents entering any point in a circuit is equal to the sum of the currents leaving that same point
Electrical Current Flow of Charged Particles
Potential Difference Energy transferred per unit charge (V = W/Q)
Electromotive Force energy transferred from source/(changed from some form to electrical energy;) per unit charge (to drive charge round a complete circuit)
Ohm The ohm is the resistance of a component when a potential difference of 1 volt is produced per ampere of current.
Ohm's Law For a metallic conductor at constant temperature, the current in the conductor is directly proportional to the potential difference across its end
Progressive Force A progressive Force is one that transfers energy away from its source
Displacement Displacement is how far a point on a wave as moved from its undisturbed position.
Amplitude The maximum displacement from any point on the wave from its undisturbed position is the amplitude. Amplitude is measured in meters. Greater amplitude means louder sound or rougher sea.
Wavelength The distance from any point on a wave to the next exactly similar point (crest to crest) is the wavelength
Period T The time taken for one complete oscillation of a point in a wave is called the period T. It is the time taken for a point to move from one particle position and return to that same position (measured in seconds)
Frequency The number of oscillations per unit time of a point in a wave is called its frequency F. 1 Hz is one oscillation per second. F = 1/T
Phase difference The amount by which one wave lags behind another wave. Measured in degrees or radians.
Intensity Intensity is the rate of flow of energy per unit area at right angles to the direction of the wave measured in Wm-2 Intensity = amplitude^2
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