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A battery of 1.5 V may be connected acro...

`A` battery of `1.5 V` may be connected across the point `A` and `B` as shown in Fig . What is the current drawn from the battery if the positive terminal of the battery is connected to `` the point `A` and `` the point `B`. The junction diodes `D_(1)` and `D_(2)` used are ideal diodes.

Text Solution

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When positive terminal of the battery is connected to point A the diode `D_(1)` gets forward biased and diode `D_(2)` is reverse biased. The diode `D_(1)` offer zero resistance and diode `D_(2)` offer infinite resistsnce. Now the given circuits will be reduced to the circuit shown in Fig.

Current drawn from the battery,
`I=(1.5V)/(20Omega)=0.075A`
When positive terminal of the battery is connected to point B, the diode `D_(2)` gets forward biased and diode `D_(1)` gets reverse biased. Now the diode `D_(1)` will offer infinite resistance and diode `D_(2)` will offer zero resistance. The equivalent circuit will be as shown in Fig. 9.39. Current drawn from
the battery, `I=(1.5V)/(40Omega)=0.0375A`
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