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Physics - Electricity


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Physics - Electricity


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Lauren Noack


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[Front]


Elementary charge (e): the “size” of the charge on a proton or electron Coulomb (C): SI unit 1 C = combined charge of 6.2x10^8 protons - 1 proton has a charge of +1.61x10^-19 C - 1 electron has a charge of -1.61x10^-19 C
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Measuring charge

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34 questions
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Answer:
Circuit diagram - match name to symbol
Q = ne x qe Therefore..
Calculating the number of electrons that flow through a certain point.
Ne = (? x ?)/qe ne = 20 x (30 x 60) /−1.6x10^−19 ne = 2.25x10^23 electrons
Calculate the number of electrons that pass through a point with 20 A over 30 min.
V = 10 V E = ? Q = 5 C E = 50 J
Calculate the amount of electrical potential energy carried by 5 C of charge at a potential difference of 10 V.
E = ? V = 12 V I = 0.75 A t = (5 x 60) = 300 s E = 2700 J
A potential difference of 12 V is used to generate a current of 750 mA to heat water for 5 minutes. Calculate the energy transferred to the water in that time.
P = ? V = 120 V I = 6 A P = 720 W
An appliance running on 120 V draws a current of 6 A. Calculate the power used by this application.
V = 240 I = 10 R = ? R = 24 Ω
An electric heater draws 10 A of current when connected to a 240 V power supply. Calculate the resistance of the element in the heater.
Parallel, as each is provided with an equal potential difference.
Consider a scenario where you have two circuits. Each circuit has two light bulbs. Circuit A has the light bulbs connected in series, circuit B has them connected in parallel. In which circuit will the light bulbs shine brightest?
Derived form V=IR Vout = Vin x R2/(R1 + R2)
Voltage dividers (don't need it but it's easier)