Science 202-II - 42Qs

A transformer consists of

• Metal Core

• Metal core and coiled wire

• Metal core and polymer wire

• Polymer core and metal wire

Transformer is a device that

• converts AC voltage to current

• converts electrical energy to kinetic energy

• converts AC voltage to a different level at the same amplitude

• converts AC voltage to a different level at the same frequency

Step-up transformer is a transformer that increases...

• voltage.

• current.

• resistance.

• conductance.

A secondary coil of a transformer has 500 windings. It was supplied with 200 V. How many windings are needed at the primary coil to produce 100 V?

I₃ in the circuit image would equal

• 1.5 A

• 10 A

• 6.67 A

• 1.75 A

The total resistance of all three resistances combined would be

• 80 Ohms

• 40 Ohms

• 7.6 Ohms

• 3.65 Ohms

Transpose the formula for $ R = \frac{\rho l}{A} $ to make A the subject

• $ A = \frac{\rho l}{R} $

• $ A = \frac{R}{\rho l} $

• $ A = \frac{\rho}{lR} $

• $ A = \frac{1}{\rho A} $

Potential difference is measured in?

• Volts

• Amps

• Current

• Ohms

What is the definition of current?

• flow of newtrons

• flow of electrons

• flow of protons

• none

Set up the problem so that you can solve for X.

• sin X = 41/28

• tan X = 41/28

• cos X = 28/41

• sin X = 28/41