Give the SI unit of resistivity. a) ohm/metre2 b) ohm metre2 c) ohm metre d) ohm/metre
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Give the SI unit of resistivity.
a) ohm/metre2
b) ohm metre2
c) ohm metre
d) ohm/metre

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- What is the resistance of the following circuit measured between points a and b? R1 R2 5k 5k R5 a b 1k R3 R4 2k 2kA 540 W electric heater is designed to operate at 120 V. What is its resistance? A) 26.7 Ω B) 22.2 Ω C) 4.50 Ω D) 20.3 Ω6. The resistance of wire A is 12 N. Wire B, made of the same material as wire A, is twice as long and has half the cross-sectional radius. How much resistance does wire B have? A)15 Q B)12 Q C)48 Q D)96 Q
- Content Material Aluminum Copper Gold Iron Platinum Silver Tungsten Problem Resistivity (22.m) 2.65 x 10-8 1.68 x 10-8 2.44 x 10-8 9.71 x 108 10.6 x 10-8 1.59 x 10-8 5.60 x 10-8 As shown below, an insulated tungsten wire is immersed in 398 g of water at 12 °C. The wire is 1.9 cm long and has a cross-sectional area of 0.006 cm². wire A.) Determine how much heat is needed to bring the water to a boil. The specific heat of water is 4186 J/kg.K. Q = B.) Determine how long it will take to bring the water to a boil if a 13 A current is run through the wire. Assume all the thermal energy generated by the wire is absorbed by the water. At =What current will a 3.0 V battery cause to flow? The resistance of the battery is 14.0 Ω. A) 4.7 A B) 42 A C) 130 A D) 0.21 A1. A circuit consists of a 9.0 V battery connected to three resistors (47, 17 , and 160 ) in series. (a) Find the current that flows through the battery. --- mA
- 3. Determine the currents I1, I2 and I3 in the circuit below using Kirchhoff's Laws. 30 2 I, Loop 1 40 2 I3 12 82 = 45 V a d C b 20 2 Loop 2 I2 E1 = = 85 V 12 e5) a) Apply Kirchhoff's rules to the circuit below. You will need to indicate each current, one in each branch of the circuit, on the diagram. V battery R₁ R4 R3 R₂ R5Four 1.5 V cells are connected in series to a 12 ohm light-bulb. If the resulting current is 0.45 A, what is the internal resistance of each cell, assuming they are identical and ne- glecting the wires? A) 1.32 ohm B) 0.33 ohm C) 0.45 ohm D) 1.5 ohm
- 12. What is the equivalent resistance of these two resistors? A) 0.48Ω Β) 2.1Ω C) 10Ω D) 21Ω Page 6 3Ω {{7Ω ΖΩ καιWire Radius (mm) Wire Radius (m) Cross-sectional Area, pr2 (m2) 1/A (m-2) Resistance (Ohms) .9 9x10-4 2.54x10-6 3.9x105 36.54 mΩ .15 1.5x10-4 7.07x10-8 1.41x107 1200 mΩ .86 8.6x10-4 2.32x10-6 4.3x105 39.76 mΩ .65 6.5x10-4 1.33x10-6 7.5x105 68.91 mΩ .6 6x10-4 1.13x10-6 8.8x105 81.66 mΩ Given the table, what is the Slope of Resistance vs. 1/A? The wire length is 5.8m.Pane 15. The resistance of the following resistor, fig. 2, is Green Blue Red Fig 2. a) 339 2 b) 5.6 k2 c) 560 2 d) 260 k2 16. 2A current passes through a resistor of 60 2 when a battery is connected across this resistor. The voltage across the resistor is a) 120V b) 220V c)15 V D) 30V