A transformer has a secondary voltage of 140 volts and a secondary current of 3.5 amps. if the primary current is 10 amps, what

Question

OleMash

9 days ago

13

A transformer has a secondary voltage of 140 volts and a secondary current of 3.5 amps. if the primary current is 10 amps, what

is the primary voltage? (in this case, the voltages and currents are inversely proportional.)

Physics

1 answer:

kicyunya [3.1K] · Answer 1 · 2026-03-31T22:50:46+03:00

In the case of an ideal transformer, power loss is regarded as nonexistent

meaning that the power in the primary coil resulting from the input voltage must equal the power in the secondary coil resulting from the output voltage

This relationship can be expressed as an equation

$V_1 i_1 = V_2 i_2$

Here, we know that

$V_2 = 140 volts$

$i_2 = 3.5 A$

$i_1 = 10 A{/tex]now we will use above equation[tex]140*3.5 = 10 * V_1$

$V_1 = 49 volts$

Thus, the voltage across the primary coil is 49 Volts