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Current Theory is an app that helps you practise, understand, and master electrical theory.

9:41

Quick 10 12

Earth fault protection

What does an RCD primarily protect against?

A Earth leakage current

B Overload current

C Short circuit current

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Quick 10 Q4 / 10

Solid. That's the one.

RCDs trip on earth leakage current to protect against electric shock.

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Your shape grows as you prove each topic.

Earthing systems Weakest topic · a short drill helps this click 34%

Train weak areas

Progress This week

76%

exam ready

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1,240 XP earned

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RCDs: would you pass?

2-min theory rep

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1,000+

theory cards, organised by topic

Earthing Cables Testing +9 more

Weak area 34%

Earthing systems

On track 88%

Circuit protection

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Lined up for you: Earthing systems

78% exam ready

Full theory mock

60 questions · 90 minutes

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Timed sprint 20 questions · 12 minutes

Regulations mock 40 questions · 60 minutes

Weekly crew goal 64%

320 / 500 reps this week

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