A worker uses a cart to move a load of bricks weighing 680 N a distance of 10 m across a parking lot.
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The equation that relates the voltages and the number of turns in a transformer is
where
is the voltage in the secondary coil, 
is the voltage in the primary coil, and 
and 
are the number of turns on the secondary and primary coils.
Using the numbers, we find the ratio between the number of turns:
where
Using the numbers, we find the ratio between the number of turns: