Electrical Safety
Akopọ
The mains supply that powers your home is useful and dangerous in equal measure. A frayed cable, a damp room or an overloaded socket can cause a shock or a fire, so every house and appliance is built with layers of protection you may never notice.
In this lesson you will learn the hazards of mains electricity and the safety features that guard against them: the three wires of a mains circuit, why the switch and fuse go in the live wire, how fuses and trip switches work, and why appliances are earthed or double-insulated.
Awọn Afojusun
- [Core] Describe the heating effect of current
- [Core] State the hazards of: (a) damaged insulation (b) overheating cables (c) damp conditions (d) excess current from overloading of plugs, extension leads, single and multiple sockets when using a mains supply
- [Core] Explain the use and operation of trip switches and fuses and choose appropriate fuse ratings and trip switch settings (knowledge of RCDs (Residual Current Devices) is not required)
- [Core] Explain why the outer casing of an electrical appliance must be either non-conducting (double-insulated) or earthed
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Electrical Safety. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- A switch must be connected in the live wire so that, when off: A. the appliance still works B. the appliance is disconnected from the live voltage C. the neutral is broken D. the earth is connected Answer: B
- A fuse protects a circuit by: A. increasing the current B. melting and breaking the circuit if the current is too high C. earthing the case D. storing charge Answer: B
- Which is NOT a hazard of mains electricity? A. damaged insulation B. overheating cables C. a correctly rated fuse D. damp conditions Answer: C
- An appliance with a plastic case that needs no earth wire is: A. earthed B. double-insulated C. unfused D. short-circuited Answer: B
- An appliance normally draws 9 A. The most suitable fuse is: A. 3 A B. 5 A C. 13 A D. 1 A Answer: C
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Electrical Safety? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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Gbogbo ohun ti o nilo lati ṣe dara julọ ninu JAMB, WAEC ati NECO.
