1. A refrigerator and a rice cooker are connected in parallel to a 220 V line. The current in the refrigerator is 10 A and in the rice cooker is 4 A. Find the resistance of each device a. b. the total resistance, and the current flowing in the line. с.

3. Use the table of values in SSLM week6, p3. Calculate the resistance of copper wire, 100m length, 1.0mm diameter a. circular cross section (in Ohms). B. Having same resistance in (a), what would be the length of aluminum made, 1.0mm diameter-circular cross section (in m)? b. C. If the copper wire in (a) was replaced by steel material, having the samne length of 100m, what is diameter of a circular cross section wire (in m)?

A geological core sample is taken at a coal mine.   The sample is a cylinder 20.7 feet long and 5.25 inches in diameter. The geologists run electric current through the sample to find its resistivity, which can be used to determine the quality of the coal. A voltage of 5030 V (5.03 × 103 V) is found to produce 11.4 mA of current through the sample. a. What is the resistance in the coal sample? b. What is the resistivity of the sample?

A battery has an EMF of 24.0 V and an internal resistance of ‘r’. Its terminals are connected to aload resistance of 5.25 Ω.a. Find r and current in the circuit if the terminal voltage of the battery is 22.5V.b. Calculate the power delivered to the load resistor, the power delivered to the internalresistance, and the power delivered by the battery.

Q5. A 4.80-m length of 2.0-mm-diameter wire carries a 750-mA dc current when 22.0 mV is applied to its ends. If the drift velocity is determine 1.7x105 m/s (a) the resistance R of the wire, (b) the resistivity and (c) the number n of free electrons per unit volume.

18. A 6V battery having an internal resistance 60 is connected to a load resistor. The current through the circuit is 0.1A. The terminal voltage across the load is a. 6.2V b. 6.6V c. 6V d. 5.4V 19. If the velocity and acceleration of an object are in the same direction, a. The object remains at rest. b. The speed of the object increases with time. c. The speed of the object decreases with time d. The speed of the object remains constant.

13. The electric charge that moves through a conductor varies in accordance with the equation q(t) 950t, where Q and t are given in pC and msec respectively. Calculate the current in A.

F₁ = L1, B₂ чт вът Різі чом =1032 V R -Gv 100 qüdrh I 1 R2 R23 2. Four resistors and a 6.0-V battery are arranged as shown in the circuit diagram. Find the equivalent resistance of the circuit b. Find the current through the 10-Ohm resistor a. sonsufit c. Find the power delivered to the 10-Ohm resistor R₁-4092 -18V -18V 13 C+ D B=6V 6VI Azov I=I1 + 0.64 AQUOS to 218-12 = 30 I H = -1 R4-2002 14. 0.64 1₂V R₂-3002 -IA F 12V E R3=1092 holong s vivang to 6 DS sailwaqogani THOS T20 3. A horizontal wire of length 6.0m carries a current of 6.0A and is oriented so that Forth's magnetic field is due north at this

23. 2. Each resistor in the circuit below has a resistance of 3 ohm. The voltage supplied by the battery is 12 V. What is the voltage across and current through the resistor B? a. A The current flowing through the resistor A is = ......A b. The voltage drop across the resistor A is =.....V

A 9V battery is connected to a bulb with a resistance of 60ohms and resistor with a resistance of 50ohms in series. i. What is the total resistance of the circuit? ii. Compute for the current flowing in the circuit. i. If the resistor and bulb are connected in parallel, compute for the total current.