Electric Circuits Equations 0.0 / 5 ? PhysicsElectric CircuitsASEdexcel Created by: emilylang1Created on: 31-10-20 16:06 Total charge (Q) Q= ne 1 of 29 Current I= Q/t 2 of 29 Voltage V= E/Q 3 of 29 emf ε= E/Q 4 of 29 pd V= W/Q 5 of 29 1 eV 1.6x10^-19 J 6 of 29 1 MeV 1.6x10^-13 J 7 of 29 Resistance (Ohm’s law) R= V/I 8 of 29 Resistance (Resistivity) R= pl/ A 9 of 29 Transport Equation I= nAvq 10 of 29 Total Resistance total V/ I 11 of 29 Total Resistance in Series Rt= R1 + R2 12 of 29 Total Resistance in Parallel 1/Rt= 1/R1 + 1/R2 13 of 29 Current in Series Trick Question- it’s the same throughout 14 of 29 Total Current in Parallel It= I1 + I2 15 of 29 Total Voltage in Series Vt= V1 + V2 16 of 29 Voltage in Parallel Trick Question- it’s the same on each branch 17 of 29 Electric Current Rule ΣI= 0 18 of 29 Electrical Voltages Rule Σε= ΣV 19 of 29 Voltages Rule with Calculated pds Σε= ΣIR 20 of 29 Potential Divider Equation V(out)= V(in) x [R2/(R1 +R2)] 21 of 29 Internal Resistance r= V(internal)/I 22 of 29 Terminal pd (internal resistance) V= ε- Ir 23 of 29 pd Across Variable Resistor V(R)= ε- V(r) 24 of 29 Work Done by a Component in an Electric Circuit W= VIt 25 of 29 Power for a Component in an Electric Circuit P= VI 26 of 29 Resistor Power Dissipation (I) P= I^2R 27 of 29 Resistor Power Dissipation (V) P= V^2/R 28 of 29 Efficiency Useful EPW output/ Total EPW input 29 of 29
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