A transformer has 400 turns in the primaryand 8 turns in the secondary. (a) Is t

Question

A transformer has 400 turns in the primaryand 8 turns in the secondary. (a) Is this a step-up or step-downtransformer?
1---Select---step-upstep-down

(b) If the primary is connected across 110V rms, what is the open-circuit voltage across the secondary?
2 V

(c) If the primary current is 0.1 A, whatis the secondary current, assuming negligible magnetization currentand no power loss?
3 A (a) Is this a step-up or step-downtransformer?
1---Select---step-upstep-down

(b) If the primary is connected across 110V rms, what is the open-circuit voltage across the secondary?
2 V

(c) If the primary current is 0.1 A, whatis the secondary current, assuming negligible magnetization currentand no power loss?
3 A

Explanation / Answer

(a) Step-down, less turns in secondary means step-down. (b) Vout = (nP/nS) x Vin              = (8/400) x 110              = 2.2V (c) Iout = (nS/nP) x Iin = (400/8) x 0.1            = 5 A

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