Inverse Square Law and Transformer Law

module 5

transformers

devices used to increase or decrease voltage (or
current) through electromagnetic induction

step-up

transformer that increases voltage

step-down

transformer that decreases voltage

step-up

transformer that decreases current

step-down

transformer that increases current

inverse 

the change in voltage and current has an ……. relationship 

transformer 

used to change the magnitude of voltage and current in an AC circuit 

transformer law

refers to the relationship between voltage, current, and the number of turns in the coils of a transformer, which is based on Faraday's Law of Electromagnetic Induction

directly

The change in voltage is …… proportional to the ratio of the number of turns (windings) of the secondary coil

transformer law

The change in voltage is directly proportional to the ratio of the number of turns (windings) of the secondary coil

10 times

If there are 10 turns on the secondary coil for every turn on the primary coil, then the voltage generated in the secondary circuit (Vs) will be ….. the voltage supplied to the primary circuit (Vp)

ns/np

vs/vp=

turns ratio

ns/np refers to the 

500:1

THE SECONDARY SIDE OF A TRANSFORMER HAS 300,000 TURNS; THE PRIMARY SIDE HAS 600 TURNS

proportional

The voltage change across the transformer is …… to the turns ratio

step-up transformer

when a transformer is greater than 1

step-down transformer

when a turns ratio is less than 1

intensity

the ….. of light diminishes by a factor of the square of the distance from
the source

I1D1²=I2D2²

inverse square law formula

intensity

in the inverse square law the I is the

distance

in the inverse square law d is the

less

the farther you are the …. exposure reaches you

1/4

when the distance is doubled, the intensity is reduces to

increased, 4

when the distance is halved, the intensity is …. by a factor of ….