A galvanometer has a resistance of 30 2. It gives a full scale deflection with a current of one miliampere. How will you convert it into an ammeter to measures current upto 1 A?
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- Currents up to 30 A can be carried by 10 gauge copper wire. (a) What is the resistance of 80 m of 10 gauge copper wire? 2.585e-7 (b) What is the electric field in the wire when the current is 30 A? mV/m (c) How long does it take for an electron to travel 80 m in the wire when the current is 30 A?What is the current in milliamperes produced by the solar cells of a pocket calculator through which 2.00 C of charge passes in 9.00 h?If the battery in the circuit below is 15.42V, resistor R₁=442.11, and resistor R₂-379.37, what is the magnitude of the current flowing through the circuit? Please give your answer in units of milli-Amps (mA). R₂ R₁ A B E Note: It is understood that the unit of your answer is in milli-Amperes (mA), however do not explicitly include units in your answer. Enter only a number. If you do enter a unit, your answer will be counted wrong.
- A 1 m long wire is stretched to 1.7 m long. What is the percentage change in its resistance? SR R The change, 100% = 70 Units no units required ✓✓A wire with a temperature coefficient of resistance (-0.0060/C) has a resistance of 5.64 at 20° and a second wire with a temperature coefficient of resistance (0.0064/C) has a resistance of 5.25 at 20°. At what temperature will the two wires have the same resistance?.A short circuit to the grounded metal case of an appliance occurs as shown in the figure below. The person touching the case is wet and only has a R₂ = 7.15 kn resistance to earth/ground. Vcase=? PCB ww /=? 5 mA (a) What is the voltage (in V) on the case if 5.00 mA flows through the person? V (b) What is the current (in A) in the short circuit if the resistance of the earth/ground wire is R = 0.10 07
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