(Savvas 21.3) Ch. 21.3 Electrical Energy Generation and Trans.

A magnetic field can be used to produce an electric current. True or false?

• True

• False

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What is the name of the process of generating a current by moving an electrical conductor relative to a magnetic field?

• electromagnetic force

• electromagnetic field

• electromagnetic induction

• electromagnetic conduction

Tags

NGSS.HS-PS2-5

A generator converts _______________ energy into _______________ energy.

• mechanical; electrical

• electrical; mechanical

• chemical; electrical

• thermal; mechanical

Tags

NGSS.HS-PS3-3

A motor converts _______________ energy into _______________ energy.

• mechanical; electrical

• electrical; mechanical

• chemical; electrical

• thermal; mechanical

Tags

NGSS.HS-PS3-3

A device that increases or decreases voltage and current of two linked AC circuits is called a(n) _______________.

• transformer

• resistor

• capacitor

• generator

A transformer changes voltage and current by using

• chemical reactions.

• electromagnetic induction.

• mechanical energy.

• thermal energy.

Tags

NGSS.HS-PS2-5

Transformers are necessary for home electrical service because

• they increase the voltage for home use.

• they decrease the voltage to a safe level for home use.

• they generate electricity for homes.

• they store electrical energy for later use.

Voltage is decreased for long-distance transmission to prevent overheating wires. True or false?

• True

• False

Answer explanation

Voltage is increased for long-distance transmission to reduce the power losses due to resistance in the wires.

A step-down transformer decreases voltage and increases current. True or false?

• True

• False

A device with fanlike blades that can turn the coils or magnets in a generator is called a _______________.

• turbine

• motor

• battery

• transformer

Tags

NGSS.HS-PS3-3