Mains Electricity
Muhtasari
The electricity that powers your home, school and workplace arrives through the mains supply. It is far more powerful than a battery, which is why every plug and appliance includes safety features designed to prevent electric shock and fire.
In this lesson you will learn the difference between a.c. and d.c., how the UK mains supply works, why plugs have three pins, how fuses and circuit breakers protect you, and how to calculate electrical power and energy transferred using the equations P = IV and E = Pt.
Malengo
- Know and use the relationship between power, current and voltage: P = I x V
- Know the difference between mains electricity being alternating current (a.c.) and direct current (d.c.) being supplied by a cell or battery
Maelezo ya Somo
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Mains Electricity. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- Mains electricity in the UK is: A) D.C. at 12 V B) A.C. at 230 V C) D.C. at 230 V D) A.C. at 12 V Answer: B
- The live wire in a three-pin plug is coloured: A) Blue B) Green and yellow C) Brown D) Red Answer: C
- A fuse protects a circuit by: A) Increasing the resistance B) Melting and breaking the circuit when current is too high C) Reducing the voltage D) Reversing the current direction Answer: B
- A double-insulated appliance does not need: A) A plug B) A live wire C) An earth wire D) A neutral wire Answer: C
- P = IV. A 460 W appliance on 230 V draws a current of: A) 0.5 A B) 2 A C) 20 A D) 105 800 A Answer: B
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Mains Electricity? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
Pakua Programu Kwenye Google Playstore
Kila kitu unachohitaji ili kufaulu katika JAMB, WAEC & NECO.
