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The gate-cathode curve for an SCR is given by the relation Vg = (1+10)Ig. The gate voltage source is a rectangular pulse of peak value 15 V and current = 0.659 A. Find the source resistance.

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The gate-cathode curve for an SCR is given by the relation Vg = (1+10)Ig. The gate voltage source is a rectangular pulse of peak value 15 V and current = 0.659 A. Find the source resistance.

(a) 90.2 Ω

(b) 11.24 Ω

(c) 46.2 Ω

(d) 39 Ω

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This intriguing question originated from Firing Circuits-1 in portion Other Circuits of Power Electronics

1 Answer

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by (45.1k points)
Right choice is (b) 11.24 Ω

Best explanation: Es = Rs.Ig + Vg

Vg = 1+10 Ig

Therefore Rs = (15-1)/0.659.

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