Techno Mum: How does it work?

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About Techno Mum
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DAB Digital Radio
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How do radios know what song is playing?
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How does a card know how much money is in the bank?
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Why do batteries die?
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How can computers identify a song?
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How do fingerprint scanners work?
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What do car batteries do?
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Smoke Alarms
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Telly
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Digital Roads
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How do electronic car keys work?
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How do game controllers work?
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WiFi Wonders

WiFi Wonders
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Zappers and Controllers

Zappers and Controllers
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Techno Security

Techno Security
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