Understanding Electrical Current

The video tutorial explains the differences between portable and stationary CD players in terms of their power sources. It discusses how portable CD players use electricity from batteries, while stationary ones use alternating current from power plants. Alternating current, which reverses direction 120 times per second, is contrasted with direct current from batteries, which flows in one direction.

What powers a portable CD player?

• Wind energy

• Electricity from power plants

• Solar energy

• Electricity from batteries

What is the main characteristic of alternating current?

• It flows in one direction

• It is only used in batteries

• It is derived from chemical energy

• It reverses direction multiple times per second

How many times does alternating current reverse direction every second?

• 150 times

• 60 times

• 100 times

• 120 times

What type of current is provided by batteries?

• Direct current

• Static current

• Alternating current

• Dynamic current

What is the source of energy for direct current?

• Solar energy

• Mechanical energy

• Chemical energy

• Thermal energy