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(II) A 75-W, 120-V bulb is connected in parallel with a
25-W, 120-V bulb. What is the net resistance?
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- Consider the circuit below. The battery has an emf of = 30.00 V and an internal resistance of r = 1,00 . (a) Find the equivalent resistance of the circuit and the current out of the battery. (b) Find the current through each resistor, (c) Find die potential drop across each resistor, (d) Find the power dissipated by each resistor, (e) Find the total power supplied by the batteries.Check Your Understanding If you place a wire directly across the two terminal of a battery, effectively shorting out the terminals, the battery will begin to get hot. Wiry do you suppose this happens?Check Your Understanding Consider the electrical circuits in your home. Give at least two of circuits that must use a combination of series and parallel circuits to operate efficiently.
- Check Your Understanding The voltage supplied to your house varies as V( t )= V max sin( 2ft ) If a resistor is connected across this voltage, will Ohm’s law V = IR still be valid?A 0.50-W, 220- resistor carries the maximumcurrent possible without damaging the resistor. If the current were reduced to half the value, what would be the power consumed?(II) Eight identical bulbs are connected in series across a120-V line. (a) What is the voltage across each bulb? (b) Ifthe current is 0.45 A, what is the resistance of each bulb,and what is the power dissipated in each?
- (II) You buy a 75-W lightbulb in Europe, where electricityis delivered at 240 V. If you use the bulb in the United Statesat 120 V (assume its resistance does not change), how brightwill it be relative to 75-W 120-V bulbs? [Hint: Assumeroughly that brightness is proportional to power consumed.](II) A 120-V hair dryer has two settings: 950 W and 1450 W.(a) At which setting do you guess the resistance to be higher?After making a guess, determine the resistance at (b) thelower setting, and (c) the higher setting.A three-way lightbulb can produce 50 W, 100 W, or 150 W, at 120 V. Such a bulb contains two filaments that can be connected to the 120 V individually or in parallel (Fig. 19–74). (a) Describe how the connections to the two filaments are made to give each of the three wattages. (b) What must be the resistance of each filament? FIGURE 19–74 Problem 68.
- (II) Two aluminum wires have the same resistance. If one hastwice the length of the other, what is the ratio of the diameterof the longer wire to the diameter of the shorter wire?Can a copper wire and an aluminum wire of the samelength have the same resistance? Explain6. (II) A hair dryer draws 7.5 A when plugged into a 120-V line. (a) What is its resistance? (b) How much charge passes through it in 15 min? (Assume direct current.)