Question

Transformers can be used to allow the 120 V current from your wall and can be used to power a 10 V blowdryer, but not a 150 V refrigerator.

Group of answer choices

True

False

Flag question: Question 2
Question 24 pts
If the secondary coil in a transformer has 40 turns, and the primary coil with 20 turns is charged with a p.d. 50 V, then the p.d. in the secondary coil would be _(blank)_.
Group of answer choices

60 V

25 V

50 V

100 V

Flag question: Question 3
Question 34 pts
In a transformer, p.d. is induced in the _(blank)_.
Group of answer choices

secondary coil

core

variable resistor

primary coil

Flag question: Question 4
Question 44 pts
If you want your 12.6 V car battery to power your new 200 V aftermarket sound system, what is the required ratio of loops on the primary coil to loops on the secondary coil?
Group of answer choices

1:16

1:8

16:1

8:1

Flag question: Question 5
Question 54 pts
If you plug a 9.0 V battery into a transformer with a primary coil of 54 loops and a secondary coil of 45 loops, what will be the resulting p.d. in the secondary coil?
Group of answer choices

12 V

11 V

7.5 V

4.5 V

Answer 1

Step-by-step explanation:

What the heck is a p.d.? I'm going to assume it is voltage potential as measured on opposite ends of each transformer winding with infinite load resistance.

1) False

A step up transformer could convert 120 vac to 150 vac

2) 100 V

Change in voltage is proportional to change in winding counts.

3)

The induced voltage occurs in the secondary coil

4)

Kind of a trick question because a car battery is a direct current source and cannot be used in a transformer to change voltage to drive a power device. If one were to use an inverter to create an alternating current with the same peak voltage and run that through a transformer with turns ratio 12.6 primary : 200 secondary or roughly 1:16, then the possibility exists.

5)

Again, a trick question as a battery is a direct current source.

If one did connect a battery to a transformer, then during the inrush phase after initial connection, the secondary side of the transformer would see a voltage of

9.0(45/54) = 7.5 V

After a few milliseconds the secondary side would show 0V