A wire of resistance 8.0 is connected to a battery whose emf is 4.0 V and whose internal resistance is 1.0 2. (a) How much energy is transferred from chemical to electrical form in 2.0 min? (b) How much energy appears in the wire as thermal energy in that time?

A potential difference of 1.00 V is maintained across a 10.0- resistor for a period of 20.0 s. What total charge passes by a point in one of the wires connected to the resistor in this time interval? (a) 200 C (b) 20.0 C (c) 2.00 C (d) 0.005 00 C (e) 0.050 0 C

A battery is used to charge a capacitor through a resistor as shown in Figure P27.44. Show that half the energy supplied by the battery appears as internal energy in the resistor and half is stored in the capacitor. Figure P27.44

Lightbulb A is marked 25.0 W 120. V, and lightbulb B is marked 100. W 120. V. These labels mean that each lightbulb has its respective power delivered to it when it is connected to a constant 120.-V source. (a) Find the resistance of each lightbulb. (b) During what time interval does 1.00 C pass into lightbulb A? (c) Is this charge different upon its exit versus its entry into the lightbulb? Explain. (d) In what time interval does 1.00 J pass into lightbulb A? (e) By what mechanisms does this energy enter and exit the lightbulb? Explain. (f) Find the cost of running lightbulb A continuously for 30.0 days, assuming the electric company sells its product at 0.110 per kWh.

A 20.00-V battery is used to supply current to a 10-k resistor. Assume the voltage drop across any wires used for connections is negligible, (a) What is the current through the resistor? (b) What is the power dissipated by the resistor? (c) What is the power input from the battery; assuming all the electrical power is dissipated by the resistor? (d) What happens to the energy dissipated by the resistor?

Review. When a straight wire is warmed, its resistance is given by R = R0,[1 + a(T T0)] according to Equation 27.20, where a is the temperature coefficient of resistivity. This expression needs to be modified if we include the change in dimensions of the wire due to thermal expansion. For a copper wire of radius 0.100 0 mm and length 2.000 m, find its resistance at 100.0C, including the effects of both thermal expansion and temperature variation of resistivity. Assume the coefficients are known to four significant figures.

If the terminals of a battery with zero internal resistance are connected across two identical resistors in series, the total power delivered by the battery is 8.00 W. If the same battery is connected across the same resistors in parallel, what is the total power delivered by the battery? (a) 16.0 W (b) 32.0 W (c) 2.00 W (d) 4.00 W (e) none of those answers

A solar cell generates a potential difference of 0.17 V when a 520 0 resistor is connected across it, and a potential difference of 0.25 V when a 940 resistor is substituted. What are the (a) internal resistance and (b) emf of the solar cell? (c) The area of the cell is 2.5 cm? and the rate per unit area at which it receives energy from light is 5.1 mW/cm². What is the efficiency of the cell for converting light energy to thermal energy in the 940 Q external resistor? (a) Number i Units (b) Number i Units (c) Number Units > >

Each of the six real batteries in the figure has an emf of 18.6 V and a resistance of 3.89 0. (a) What is the current through the (external) resistance R=3.51 Q? (b) What is the potential difference across each battery? (c) What is the power of each battery? (d) At what rate does each battery transfer energy to internal thermal energy? (a) Number (b) Number (c) Number (d) Number M. P rod Units A Units V Units W Units W R >

Each of the six real batteries in the figure has an emf of 20.3 V and a resistance of 4.120. (a) What is the current through the (external) resistance R=3.57 0? (b) What is the potential difference across each battery? (c) What is the power of each battery? (d) At what rate does each battery transfer energy to internal thermal energy? R (a) Number Units Units (b) Number Units (c) Number Units (d) Number