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19 Cards in this Set
- Front
- Back
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Electric current
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amount of charge that passes through a circuit element per unit of time
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I
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electric current
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I equation
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I = Q/t
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Q
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amount of charge
measured in Coulombs [C] |
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1 C =
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the charge carried by 6.25x10¹⁸ electrons
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current
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measured in Amperes [A]
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relating amperes & Coulombs
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1A = 1 C/s
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electrical potential difference
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∆v
aka voltage drop amount of word ([W]) done per unit charge to drive electric charge through a circuit element measured in volts [V] |
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∆v formula
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∆v = W/Q
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relating volts to Coulombs
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1 V = 1 J/C
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electrical resistance
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R
amount of resistance offered to current flow by a circuit element measured in Ohms [Ω] |
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relate Ω to V
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1 Ω = 1 J·s / C²
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Ohm's Law
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current is
directly proportional to potential difference inversely proportional to circuit element resistance graphs as linear relations of I over ∆V |
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Ohmic devices
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those that obey Ohm's law
aka resistors represented by saw tooth pattern on circuit drawings |
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True current
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electrons carry a negative charge and thus move from the negative terminal of a battery to the postive
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Conventional current
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Early theorists thought that cations carried current and therefore thought that current moved from the positive to negative pole
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Simple circuit
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a circuit with 1 resistor & 1 battery
I = ∆v / R |
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Series circuit
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circuit with 2 in-line resistors & 1 battery
current is common to each resistor I_tot = I₁ = I₂ resistance is equal to sum of resistors R_tot = R₁+R₂ voltage is equal to sum of potential differences across each resistor ∆v_tot = ∆v₁ + ∆v₂ |
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parallel circuit
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resistors are in parallel
current travels from battery to point A and then splits. Each branch goes to a resistor. I_tot = I₁+I₂ ∆v_tot=∆v₁ = ∆V₂ 1/R_tot = 1/R₁ + 1/R₂ |
