Electrical Engineering ⇒ Topic : Series Circuits

Dynmo
 
Series Circuits A circuit in which two or more loads (resistors) are connected one after the other (in series) is called a series circuit. The resistance of the connecting wires is very small and therefore is neglected in the calculations involving resistor loads.  
 
David
 
Series Circuits A circuit in which two or more loads (resistors) are connected one after the other (in series) is called a series circuit. The resistance of the connecting wires is very small and therefore is neglected in the calculations involving resistor loads. Example of a series circuit is shown in Fig. (a). The current (I) in the circuit is 2.5 A. The voltages V_{1}, V_{2} and E are 7.5, 12.5 and 20 V respectively. FIGURE (a) A simple series circuit By applying Ohm's law, we find that R_{1} = V_{1}/I = 7.5/2.5 = 3 Ω and R_{2} = 12.5/2.5 = 5Ω, and the total resistance is E/I= 20/2.5 = 8 Ω Also E = V_{1} + V_{2} (by applying Kirchhoff's law) IR = IR_{1}+ IR_{2} (by applying Ohm's law) Therefore R= R_{1}+ R_{2 ................ (1)}  
 
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