Q25 of 71 Page 418

Find the currents through the resistances in the circuits shown in figure.




(a) In fig1, both diodes D1 and D2 are forward biased. So, resistance due to diodes=0.
Net resistance = 2Ω
Net current = 2V/2Ω = 1A


(b) In fig2, diode D1 is forward biased and D2 is reverse biased. So, no current will flow through this circuit because D2 will offer infinite resistance.
Net current = 0A


(c) In fig3, diode D1 and D2, both are forward biased, So, resistance due to diodes=0.
Net resistance = 2Ω
Net current = 2V/2Ω = 2A


(d) Diode D1 is forward biased and D2 is reverse biased. So current will flow through D1 but not through D2.
Net resistance = 2Ω
Net current = 2V/2Ω = 2A


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