# Internal Resistance Coursework

At each stage they can connect the circuit, take readings quickly and then disconnect the power supply.If you use a mains power supply, use one that is designed to limit the output current to about 1 amp, and preferably with a current overload indicator.

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The negative connection is the centre of the base with an annular ring of insulator between it and the can.

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 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.

(i) What approximately is the current through the cable when the heater is switched on?

(ii) If the diameter of the copper core used is 1.78 mm, use the graph to determine the resistance of the connecting cable needed to carry the current. b) When a voltmeter is connected in parallel with the 15 kΩ resistor, the current in the microammeter increases to 250 μA. b) An isolated conducting sphere of radius 1.00 cm is supported by a fine insulating thread and charged to a high potential, V, relative to Earth with an electrostatic device. c) A 22n F capacitor is connected in parallel with a high resistance voltmeter as shown above. The small conducting sphere, already charged, is brought into contact with the point P. Calculate: (i) the charge transferred to the 22n F capacitor (ii) the initial potential, V, of the small conducting sphere ( has its usual value). A thundercloud has a horizontal lower surface area of 2 km V above the earth.Train wheels and axles provide an electrical connection between the two rails on which they travel.This enables a track signalling circuit to detect the presence of a train on a given section of track.Time spent in checking the equipment before a lesson will pay dividends in the students’ understanding.Some agreement must be established within the class so that the brightness of one lamp used with one cell is ‘normal’ brightness.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.How well a circuit conducts electricity will depend on materials along the path and their dimensions.The heating effect of current is important in many applications.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.

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Two cells are connected in series, Each has an electric motor force of 1.4V and internal resistance of 0.38 ohms. They are connected across an electric circuit of.…