How many batteries are needed to power this TV?

Bonjour

New member
The TV needs 100 V and 2 A. The batteries are 2 V and 500 mA. How many batteries are needed, and in what type of circuit are they used?
Also, if a car stereo is rated 300 W when using 10 ohms speakers is connected to 4 ohms speakers, what will be the power output? I can't visualize this.
 
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