Radio questions

List all the products in your home that use some form of radio or remote control

Why can't DC currents transfer energy across transformers?

• DC currents have no magnetic properties

• DC currents don't have enough power to overcome the resistance of transformers

• Transformers block the transfer of energy from both AC and DC currents

• They are not digital circuits

The following are true about transformers except:

• They allow electricity to be effieciently transported over great distances

• They allow circuits to be isolated from each other

• They allow a small voltage to create a large voltage

• The coils used can never have the same number of loops

The following are true about radio except:

• Frequency modulation circuits are simpler than amplitude modulation circuits

• The FCC regulates radio transmission frequencies

• FM has better music quality than AM

• For DC currents, antennas act like ordinary wires

At low frequencies, the SNAP Circuits antenna acts like a _____________.

• 10kohm resistor

• .1microFaraday capacitor

• 3-snap wire

• whistle chip

The side of a transformer that has more loops of wire will have ____ than the other side

• more voltage

• more current

• less resistance

• higher frequency

In which of these frequency ranges does the spacing between components in the circuit matter the most?

• audio range - 300-3000 Hz

• AM band 500-1600 kiloHZ

• FM band (88-108) MegaHz

• spacing between components is of equal importance in all the above ranges

The electricity at the electrical outlets in your home

• is 60V

• is alternating current

• has a frequency of 120 Hz

• is direct current

Why do electric companies use high voltages when transporting electricity over long distances?

• higher voltages and lower currents reduce power loss in the wires

• The equipment on the receiving end needs a high voltage

• low voltage circuits cannot transport energy over long distances

• high voltages are safer than low voltages

Frequency modulation

• is less protected from interference than AM

• uses one signal to change the frequency of another

• Uses 7kiloHz channel bands

• was the first system for radio broadcasts to be widely used