high voltages, as it improves paragraph to explain their on and ask students to the efficiency by reducing ideas. compare the brightness Equipment: power pack; 2 x 1 heat loss in transmission of the two bulbs. metre lengths of 24 SWG lines nichrome wire; connecting Then connect a wires, crocodile clips; 2 12 V transformer to the P1.35 Explain where and why bulbs, 2 voltmeters, ammeter output of the and step-down powerpack, set up to transformers are used in the increase the voltage to transmission of electricity in 240 V, and another at the National Grid the other end to step it down to 12 V again. For P1.36 Explain ways of reducing this part of the unwanted energy demonstration the transfer including lengths of resistance through … lubrication, wires should be thermal insulation and insulated inside a low-resistance wires plastic sleeve. Ask students to compare the brightness of the bulbs. Equipment:12 V a.c power supply; connecting leads and crocodile clips; 2 x 1 metre lengths of resistance wire; 2 transformers, set up with a turns ratio of 20; 2 x 12 V bulbs.
P1.35 P1.36 high voltages, as it improves the efficiency by reducing heat loss in transmission lines Explain where and why and step-down transformers are used in the transmission of electricity in the National Grid Explain ways of reducing unwanted energy transfer including through … lubrication, thermal insulation and low-resistance wires paragraph to explain their ideas. Equipment: power pack; 2 x 1 metre lengths of 24 SWG nichrome wire; connecting wires, crocodile clips; 2 12 V bulbs, 2 voltmeters, ammeter on and ask students to compare the brightness of the two bulbs. Then connect a transformer to the output of the powerpack, set up to increase the voltage to 240 V, and another at the other end to step it down to 12 V again. For this part of the demonstration the lengths of resistance wires should be insulated inside a plastic sleeve. Ask students to compare the brightness of the bulbs. Equipment:12 V a.c power supply; connecting leads and crocodile clips; 2 x 1 metre lengths of resistance wire; 2 transformers, set up with a turns ratio of 20; 2 x 12 V bulbs.
GCSE-9-1-Science-Term-2-detailed-planning-document.docx