Effects of current

Physiological effects

• Describe how contact with current can affect a person.
• Provide a description of direct and indirect contact.
• Describe four methods of protection from direct contact.
• Describe four methods of protection from indirect contact.
• Explain what an RCD is and what it is used for.

Effects to wiring/components

• State the devices used to protect against overcurrent.
• State where automatic disconnection devices are fitted to a circuit.
• Explain how automatic disconnection devices operate.

Heating, magnetic and chemical

• Describe how current produces heating, magnetic and chemical effects.
• State advantages and disadvantages of each effect.
• Give practical examples of the use of each effect.

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