Please verify and answer all questions! Thank you. A current flowing through a c
ID: 2035321 • Letter: P
Question
Please verify and answer all questions! Thank you.
A current flowing through a copper wire (connected to a battery) is due to ADelectrons being pushed by an electric field. B) positively charged particles being pushed off the battery terminal. C) electrons being bumped by positively charged particles. D) positively charged particles being attracted to the negative terminal of a battery. You want to use a metal bar as a resistor. Its dimensions are 2 by 4 by 10 units. To get the largest resistance from this bar, you should attach leads to the two opposite sides that have the dimensions of A 2 by 4 units. B) 2 by 10 units. C) 4 by 10 units. D) any number of units because all connections give the same resistance. E) None of these is correct. Use this graph to answer the next three questions. Current In a laboratory experiment, four spools of wire are connected individually to a battery. Four sets of observations are made of the potential differences and the corresponding electric currents and are plotted as shown. Which spool has the smallest resistance? A) 1 B) 2 C) 3 In a laboratory experiment, four spools of wire are connected individually to a battery. Each wire is made from the same material and have identical lengths, but they have different diameters. Four sets of observations are made of the potential differences and the corresponding electric currents and are plotted as shown. Which spool has the smallest diameter? A1 B) 2 c) 3 In a laboratory experiment, four spools of wire are connected individually to a battery. Each wire has the same length and diameter, but they are made from different materials. Four sets of observations are made of the potential differences and the corresponding electric currents and are plotted as shown. Which wire has the greatest conductivity? 9 A) 1 B) 2 D) 4Explanation / Answer
5) Current flowing through a wire is due to a) electrons being pushed by the electric field
6) The resistance is proportional to length and inversely proportional to cross sectional area. Therefore you need to connect it in such a way that the current passes through the 10 units of length and 2 by 4 units of area.
Hence the two opposite sides should have the dimension
a) 2 by 4 units
7) V = I R
Therefore the resistance is the slope of potential vs current graph
Spool 4 has the smallest resistance
8) Smaller diameter means large resistance. Spool 1 has the largest resistance. Hence spool 1 has the smallest diameter
9) Large conductivity means small resistance. Hence spool 4 has the greatest conductivity.