P4.2f explain how this effect is used in an alternator to generate a.c., and 113-6 96-7 115-8, 234-5 in a dynamo to generate d.c. P4.2g explain how the effect of an alternating current in one circuit, in 121-3 100-1 123-5, 238-9 inducing a current in another, is used in transformers P4.2h explain how the of the potential differences across the two 121-3 100-1 123-5, 238-9 depends on the ratio of the numbers of turns in each P4.2i apply the equations linking the potential differences and numbers of 121-3 100-1 123-5, 238-9 turns in the two coils of a transformer P4.2j explain the action of the microphone in converting the pressure 120 100 122, 238 variations in sound waves into variations in current in electrical circuits, and the reverse effect as used in loudspeakers and headphones To include an understanding of how dynamic microphones work using electromagnetic induction assesses content from Topics P5-P8 and P9 Topic P5: Waves in matter P5.1 Wave behaviour P5.1a describe wave motion in terms of amplitude, wavelength, frequency 93-5 80 95-7, 218 and period P5.1b define wavelength and frequency 93-5 80 95-7, 218 P5.1c describe and the relationship between these and the wave 93-5 80 95-7, 218 velocity P5.1d apply formulae relating velocity, frequency and wavelength (M1c, 93-5 80 95-7, 218 M3c) M1c, M3c P5.1e describe differences between transverse and longitudinal waves 93-5 79 95-7, 217 To include direction of travel and direction of vibration P5.1f show how changes, in velocity, frequency and wavelength, in 98-9 79-80 100-1, 217-9 transmission of waves from one medium to another, are inter-related P5.1g describe the effects of reflection, transmission, and absorption of 98-9 82-4 100-1, 220-2 at material interface examples such as ultrasound and sonar P5.1h describe, with examples, processes which convert wave disturbances 98-9 83-4 100-1, 221-2 between sound waves and vibrations in solids
P4.2f explain how this effect is used in an alternator to generate a.c., and in a dynamo to generate d.c. 113-6 96-7 115-8, 234-5 P4.2g explain how the effect of an alternating current in one circuit, in inducing a current in another, is used in transformers 121-3 100-1 123-5, 238-9 P4.2h explain how the of the potential differences across the two depends on the ratio of the numbers of turns in each 121-3 100-1 123-5, 238-9 P4.2i apply the equations linking the potential differences and numbers of turns in the two coils of a transformer 121-3 100-1 123-5, 238-9 P4.2j explain the action of the microphone in converting the pressure variations in sound waves into variations in current in electrical circuits, and the reverse effect as used in loudspeakers and headphones To include an understanding of how dynamic microphones work using electromagnetic induction 120 100 122, 238 assesses content from Topics P5-P8 and P9 Topic P5: Waves in matter P5.1 Wave behaviour P5.1a describe wave motion in terms of amplitude, wavelength, frequency and period 93-5 80 95-7, 218 P5.1b define wavelength and frequency 93-5 80 95-7, 218 P5.1c describe and the relationship between these and the wave velocity 93-5 80 95-7, 218 P5.1d apply formulae relating velocity, frequency and wavelength (M1c, M3c) M1c, M3c 93-5 80 95-7, 218 P5.1e describe differences between transverse and longitudinal waves To include direction of travel and direction of vibration 93-5 79 95-7, 217 P5.1f show how changes, in velocity, frequency and wavelength, in transmission of waves from one medium to another, are inter-related 98-9 79-80 100-1, 217-9 P5.1g describe the effects of reflection, transmission, and absorption of at material interface examples such as ultrasound and sonar 98-9 82-4 100-1, 220-2 P5.1h describe, with examples, processes which convert wave disturbances between sound waves and vibrations in solids 98-9 83-4 100-1, 221-2
scholastic-ocr-gateway-a-physics-gcse-map-1648424.docx