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Extra info for Überschall-Flugzeug Tu-144

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How much energy is provided in this time? 6, each coulomb of electricity contained 6 J of potential energy on leaving the battery. This energy was dissipated on the journey around the circuit, so that the same charge would possess no energy on its return to the battery. The amount of energy expended by 1 C in its passage between any two points in a circuit is known as the potential difference (PD) between those points, and is measured in joules/coulomb, or volts. The international symbol for supply voltage or voltage drop has changed from V to U , the symbol for the unit of voltage (the volt) remaining as V.

Similarly Uz = IRz = 3 × 15 = 45 V and voltmeter Vz will read 45 V. 10, for a series circuit, the sum of the PDs across the individual resistors is equal to the supply voltage. To check this: 144 V + 51 V + 45 V = 240 V We can now calculate the current in each resistor. The resistors in section x each have the section PD of 144 V applied to them. 2 A. 11, for a parallel circuit the sum of the currents in individual resistors is equal to the supply current. 2 A = 3 A The 17 I3 = resistor in section y has 51 V applied to it.

Note that, for a parallel circuit: 1 the same PD occurs across all resistors 2 the current in each resistor is inversely proportional to its resistance 3 the sum of the currents in the individual resistors is equal to the supply current. As for the series circuit, the resistances must all be expressed in the same unit before using them in the formula. 13 Calculate the total resistance of three parallel-connected resistors of 6 10 , respectively. 33 1/R 9 It can be seen from this result that the equivalent resistance of any group of parallelconnected resistors is lower than that of the lowest-valued resistor in the group.

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