Back(II) A rectangular solid made of carbon has sides of lengths 1.0 cm, 2.0 cm, and 4.0 cm, lying along the x, y, and z axes, respectively (Fig. 25–36). Determine the resistance for current that passes through the solid in the x direction (Assume the resistivity is ρ = 3.0 x 10-5 Ω m).
A rectangular solid made of carbon has sides of lengths 1.0 cm, 2.0 cm, and 4.0 cm, lying along the x, y, and z axes, respectively (Fig. 25–36). Determine the resistance for current that passes through the solid in the y direction, (Assume the resistivity is ρ = 3.0 x 10⁻⁵ Ω•m).
A rectangular solid made of carbon has sides of lengths 1.0 cm, 2.0 cm, and 4.0 cm, lying along the x, y, and z axes, respectively (Fig. 25–36). Determine the resistance for current that passes through the solid in the z direction. (Assume the resistivity is ρ = 3.0 x 10-5 Ω•m) .
Eight identical bulbs are connected in series across a 120-V line. What is the voltage across each bulb?
Calculate the terminal voltage for a battery with an internal resistance of 0.900 Ω and an emf of 6.00 V when the battery is connected in series with a 610-Ω resistor.
A galvanometer has an internal resistance of 32 Ω and deflects full scale for a 48-μA current. Describe how to use this galvanometer to make an ammeter to read currents up to 25 A.
Calculate the terminal voltage for a battery with an internal resistance of 0.900 Ω and an emf of 6.00 V when the battery is connected in series with a 61.0-Ω resistor.
Neglect the internal resistance of a battery unless the problem refers to it. Ten 7.0-W Christmas tree lights are connected in series to each other and to a 120-V source. What is the resistance of each bulb?
Neglect the internal resistance of a battery unless the problem refers to it. Eight bulbs are connected in parallel to a 120-V source by two long leads of total resistance 1.4 Ω. If 210 mA flows through each bulb, what is the resistance of each, and what fraction of the total power is wasted in the leads?
What voltage will produce 0.25 A of current through a 5400-Ω resistor?
An electric device draws 5.25 A at 240 V. If the resistance of the device were reduced by 7.5%, what current would be drawn at the lower voltage?
A silicon diode, whose current–voltage characteristics are given in Fig. 40–38, is connected in series with a battery and an 860-Ω resistor. What battery voltage is needed to produce a 16-mA current?
(III) The filament of an incandescent lightbulb has a resistance of 12 Ω at 20°C and 140 Ω when hot. In this temperature range, what is the percentage change in resistance due to thermal expansion, and what is the percentage change in resistance due solely to the change in ρ? Use Eq. 25–5.
Household wiring has sometimes used aluminium instead of copper. Using Table 25–1, find the ratio of the resistance of a copper wire to that of an aluminum wire of the same length and diameter.
Household wiring has sometimes used aluminium instead of copper.Typical copper wire used for home wiring in the U.S. has a diameter of 1.63 mm. What is the resistance of 125 m of this wire?