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# Physics: 60 W light bulb operates on an effective ac voltage

Subject: Physics    / General Physics
Question

1.60 W light bulb operates on an effective ac voltage of 110 V. a. What is the effective current through the light bulb? b. From Ohm’s law, what is the resistance of the light bulb?

2.An iPod uses 3.7 volts with direct current of 865 milliamps. What is the equivalent resistance of the entire iPod system?

3.A 9 ohms resistor and a 16 ohms resistor are connected in series in a circuit with a 5.0 volts battery. Assuming negligible internal resistance in the battery, the current in the 16 ohms resistor will be

4.How differs resistance of a 50 watts bulb and a 100 watts bulb, if both run on the same voltage.

5.The potential difference across the terminals of a storage battery not connected in any circuit is observed to be 12 V. When it is connected to an external resistance the potential difference across the terminals is observed to be 11 V while the current in the external resistance is 3 A. What is the internal resistance of the battery?

6.A 40 watts fluorescent bulb is rated for use in a 120 volts line. During a brownout the actual voltage drops to 102 V. The actual power dissipated in the bulb under these conditions is

7.A 6-V battery in a simple circuit produces a current of 1.5 A through the circuit. How much power is being de livered by the battery?

8.Three resistors of 3 ohm, 6 ohm , and 2 ohm are connected in parallel with one another. What is the equivalent resistance of this combination?

9.The alternating current in wide use in homes in North America is 60 cycles per second, or 60 Hz. How many times per minute does this current reverse its direction of travel?

10.A household circuit rated at 120 volts is protected by a fuse rated at 10 amps. What is the maximum number of 100 watts light bulbs which can be lit simultaneously in parallel in this circuit without blowing the fuse?