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  • P3b
    • pendulums
      • time period depends on length, increase length, increase time period
    • hydraulics
      • different cross-sectional areas, pressure transmitted equally through a liquid, so pressure at both pistons is the same. P = F / A, so @ first piston a pressure is exerted using a small force over a small area. as 2nd pistons has a larger area so as F = P x A so there will be a larger force
    • magnetic fields
      • soft iron placed near end of solenoid = exert a force of attraction on it
    • switch mode transformers
      • smaller and lighter, operate at a frequency between 50kHz and 200 kHz, use very little power when switched on and no load is applied
    • P=VI
    • transformer - nearly 100% efficient


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