Mains Electricity
Muhtasari
The mains supply powers almost every appliance in your home. Understanding how it works and the safety features that protect you is both practically useful and a key part of the Edexcel specification.
In this lesson you will learn the difference between a.c. and d.c., how insulation, earthing, fuses and circuit breakers keep you safe, why resistors heat up, and how to calculate electrical power and energy transferred.
Malengo
- Understand how the use of insulation, double insulation, earthing, fuses and circuit breakers protects the device or user
- Understand why a current in a resistor results in the electrical transfer of energy and an increase in temperature
- Know and use the relationship: power = current x voltage
- Use the relationship: energy transferred = current x voltage x time
- Know the difference between mains electricity being alternating current (a.c.) and direct current (d.c.)
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 is: A) D.C. B) A.C. C) 12 V D) Battery powered Answer: B
- A fuse protects by: A) Increasing current B) Melting and breaking the circuit C) Increasing resistance D) Reversing current Answer: B
- P = IV. If I = 3 A and V = 230 V, power is: A) 690 W B) 233 W C) 69 W D) 6900 W Answer: A
- Double-insulated appliances do not need: A) A fuse B) A plug C) An earth wire D) Insulation Answer: C
- Energy transferred E = IVt. If I = 2 A, V = 12 V, t = 60 s: A) 1440 J B) 144 J C) 24 J D) 720 J Answer: A
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.
