If 120/7620 x 10/1 equals what primary current?

To determine the primary current from the given equation, we begin by performing the arithmetic with the fractions.

First, calculate ( \frac{120}{7620} ). This fraction simplifies to find its equivalent decimal or another fraction that can be used alongside the second fraction:

1. ( \frac{120}{7620} ) simplifies to ( \frac{1}{63.5} ) or approximately 0.0157 when converted to a decimal.

Next, multiply this result by the second fraction ( \frac{10}{1} ):

2. Multiplying ( 0.0157 ) by ( 10 ) gives ( 0.157 ).

Finally, in terms of significant figures and rounding for practical applications, this value is often approximated. Therefore, ( 0.157 ) amp can be rounded and represented as ( 0.16 ) amp for standards in electrical work.

Thus, the primary current is ( 0.16 ) amp, making this the correct choice.