* By what factor is the drift velocity multiplied as a result? c) Determine the largest effective resistance achievable with these three resistors.* b) The current is now trebled and the diameter of the wire doubled. b) Show, by calculation, how two of these resistors could be connected to produce an effective resistance of 6 kΩ.

* By what factor is the drift velocity multiplied as a result? c) Determine the largest effective resistance achievable with these three resistors. b) The current is now trebled and the diameter of the wire doubled. b) Show, by calculation, how two of these resistors could be connected to produce an effective resistance of 6 kΩ.Time spent in checking the equipment before a lesson will pay dividends in the students’ understanding.*

If short lengths of wire are used with relatively high currents and voltages, then significant electrical heating may also occur.

Students should be encouraged to adjust the voltage to keep currents small with every set of readings.

Some cell holders have clips which can bridge the insulator, causing a Modern dry cell construction uses a steel can connected to the positive (raised) contact.

Some cell holders have clips which can bridge the insulator causing a Health & Safety and Technical Notes Modern dry cell construction uses a steel can connected to the positive (raised) contact.

Students use their existing knowledge of resistors combining in parallel, and of internal resistance, to explain its operation.

Apparatus and Materials It is often up to a teacher and a particular class to decide what equipment to use to introduce electric circuits.

This is quick to do if three cells are connected in series to three rows, each consisting of three lamps, so that all lamps glow with normal brightness.

If possible, new cells should be used at the beginning of each year and the old cells used up doing other jobs.

These experiments assume prior knowledge of the concept of electric current.

Health & Safety and Technical Notes Modern dry cell construction uses a steel can connected to the positive (raised) contact.

## Comments Internal Resistance Coursework

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