(1) A wire of resistivity p is stretched to double to its length. How does it affect the (a) Resistance (b) Resistivity? (2) Draw a circuit diagram which depicts two resistors R and Rconnected in parallel with the source, ammeter, voltmeter, key, and rheostat.

I'm trying to understand this figure Assume the capacitor in the circuit is initially uncharged. Can you calculate the current through each resistor right after the circuit is connected? If so, can you explain and show how you did it?   What if the circuit has been connected and left alone for a long time. Calculate the charge on the capacitor plate

A student performs a lab where the voltagedrop across a resistor is measured as a functionof current. Plot a graph from the values givenin the following table, and determine theresistance of the circuit. Current, I (mA) Potential Difference, Current, I (mA)V  (V)0.00                           0.00200                            9.00400                           16.0600                           24.0800                           31.01000                        40.0

Calculate the current through each resistor. Assume that the values of the resistances are R 1= 24000 and R2 = 1400 ohms the emfs of the two batteries are e1 = 1.5 V and e2 = 3 V. (a) Write down the equation for the loop that travels through battery 1,resistor 1 and battery 2. (b) Write down the equation for the loop that travels through battery 2 and resistor R2. (c) Obtain the relation among three branch currents. (d) Calculate the values of the currents I1,12 and 13. (e) Calculate the power dissipated by each resistor. R1 R2 Is E1 A- В I E E E !!

In the figure circuit section AB absorbs energy at a rate of 55 W when current i 0.90 A through it is in the indicated direction. Resistance R = 2.0 Q. (a) What is the potential difference between A and B? Emf device X lacks internal resistance. (b) What is its emf? R (a) Number i Units (b) Number i Units

Three resistors with values of 60.00, 30.00 and 20.0Q, respectively, are connected in parallel to a 110.0V of a negligible internal resistance. Draw the circuit diagram and find the (a) equivalent resistance of the combined resistors, (b) current flowing through each resistor, (c) voltage across each resistor, and (d) the power dissipated by each resistor.

The figure shows a resistor of resistance R = 6.102 connected to an ideal battery of emf 8 = 15.4 V by means of two copper wires. Each wire has length 21.4 cm and radius 2.20 mm. In dealing with such circuits in this chapter, we generally neglect the potential differences along the wires and the transfer of energy to thermal energy in them. Check the validity of this neglect for the circuit of the figure below. What is the potential difference across (a) the resistor and (b) each of the two sections of wire? At what rate is energy lost to thermal energy in (c) the resistor and (d) each section of wire? 8=1 Wire 1 R Wire 2

An uncharged capacitor and to a source of emf. If ɛ = 9.00 V, C = 20.0 µF, and R = 1.00 x 102 Q, find (a) the time constant of the circuit, (b) the maximum charge capacitor after one time constant. a resistor are connected in series the capacitor, and (c) the charge the on on

(!) THE FOLLOWING QUESTIONS ARE BASED ON THE INFORMATION GIVEN R2 HERE. R1 The emf source, E = 2.5 V, of the circuit shown in the figure has negligible internal resistance. The resistors have resistances R, = 2.2N and R2 = 4N. The capacitor has a capacitance C = 5.2 µF. A) Determine the time constant T, in units of microseconds, for charging the capacitor. Answer: B) What is the charge Q on the capacitor in units of microcoulomb? Answer: