Conceptual Physics

The motion of these electrons is like that of a ball in play in a pinball machine. The ball moves fairly randomly as it rebounds ...

skepticism and opposition. Ohm’s law: potential difference and current ǻV = IR ǻV = potential difference I = current R = resista ...

25.5 - Resistivity Resistivity is used to quantify how much a material resists the flow of current. It is represented by the Gre ...

R = resistance of component ȡ = resistivity of material L = length of component A = cross-sectional area Units of resistivity: Ÿ ...

Positive Į indicates resistivity increases with temperature Negative Į indicates resistivity decreases with temperature ȡ 2 = ȡ ...

Below we derive the first equation, P = IǻV. Before deriving it, we review why a resistor consumes power. The essential componen ...

25.8 - Sample problem: solar panels A school in Los Angeles is deciding whether or not to install solar panels on its roof. The ...

For part (b), calculate the cost per kW·h. This is less than the predicted cost of electricity from the utility company, so the ...

What is the strategy? Use the equation for power as a function of current and voltage to find the current through the hair drye ...

Divide the dissipated power by the generated power to find the fraction of the power dissipated by the lines. Repeat this calcu ...

25.12 - Gotchas Do conventional current arrows reflect the flow of negative or positive charge?Positive charge. Although in a ty ...

Chapter Assumptions For any problems in this chapter that involve a household electrical outlet, assume that the voltage supplie ...

why not. i. It matters ii. It does not matter C.11You buy a light bulb in the U.S. labeled 75 watts. Since you bought it in the ...

1.7 A vacuum cleaner runs on a current of 12 amperes. How long will it take for 5.0 microcoulombs of charge to flow through it? ...

to find out what potential difference it actually supplies. You connect it to a 1.25 kȍ resistor and an ammeter (a device that m ...

6.3 You have a resistor made of an unknown material. You note that at a temperature of 20.0°C its resistance is 529 ȍ. Upon lowe ...

whose resistance was 1.0 ȍ less? (a) ȍ (b) W Section 8 - Sample problem: solar panels 8.1 The power output of the Sun is 3.91×10 ...

26.0 - Introduction Capacitors store charge, and in doing so, they store energy. They are used to store energy in devices rangin ...

plates. This insulator is called a dielectric. Air is one dielectric, but other dielectrics can be used to increase the capacita ...

26.2 - Interactive checkpoint: the fuel-cell car Honda’s FCX fuel-cell automobile uses a custom built, 8.00-farad ultracapacitor ...