Physics - tranformers 0.0 / 5 ? PhysicsElectromagnetismGCSEAQA Created by: LunaShomeiRoseCreated on: 18-12-18 20:31 transformer consist of two coils of wire. the p__ and th s___ primary and secondary 1 of 17 these two coils are connected. true? no. they're separated 2 of 17 these wires are wrapped around an __ core iron 3 of 17 why iron? it's easily magnetized 4 of 17 as current runs through primary coil, it generates... a changing magnetic field 5 of 17 this current is transmitted along iron core and passed through secondary coil, inducing a p___ d___ potential difference 6 of 17 the iron core ___ (increases/decrease?) the magnetic field increases 7 of 17 transformers only work with alternating currents. true? yes 8 of 17 why is this? we need change in magnetic field to induce potential difference 9 of 17 a ___ current produces a constant magnetic field so doesn't work in transformers direct 10 of 17 if the transformer is 100% efficient (no energy wasted), the potential difference of primary coil will be ____ as the seondonary the same 11 of 17 if the secondary coil has more loops (turns), the potential difference will be greater in the ___ coil secondary 12 of 17 this is called a step-__ transformer as it steps up the potential difference step-up transformer 13 of 17 if there's twice as many turns in the secondary coil, they'll be twice as much potential difference. true? true 14 of 17 the step-down transformer is the opposite. describe it more turns in the primary coil, meaning there's less potential difference in secondary coil 15 of 17 Power of primary coil = power of secondary coil. true? yes 16 of 17 how do you work out power? potential difference x current 17 of 17
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