3-ELE-06
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Contents
Outcomes
- Pupils can
- Use of P = IV, higher currents leads to hotter wires
- Ammeter in series, voltmeter in parallel
Specification References
2.4 know some of the different ways in which electrical heating is used in a variety of domestic contexts
2.5 understand that a current in a resistor results in the electrical transfer of energy and an increase in temperature
2.6 recall and use the relationship, power = current x voltage, P=IV and apply the relationship to the selection of appropriate fuses
2.7 use the relationship between energy transferred, current, voltage and time: energy transferred = current x voltage x time, E = ItV
2.8 recall that mains electricity is alternating
Starter
Intro to practical
Main Body of Lesson
- Use of different fuse wires to discover the heating effect of a wire depends on current, thin wires heat up more for same current
- Power output of a bulb
Plenary
- Thin wires heat up more – use of this idea to break a circuit
- Use – fuses
- Dangers of fire when using the wrong flex in low current appliances
Homework
Worksheet: Practice using P=IV and choosing fuse values
Additional Information
Resources Required
- Various fuse wires, heat proof mats, high current variable dc supplies, ammeters, voltmeters, 2.5V bulbs.
- P=IV and fuse value practice sheet
Textbook References
Website References
Skills Addressed
Practical skills – building circuits
Safety/Hazards
Burns – students must not touch wires