1.)Three resistors, 26, 46, and 76 , are connected in series, and a 0.55-A curre
ID: 1873923 • Letter: 1
Question
1.)Three resistors, 26, 46, and 76 , are connected in series, and a 0.55-A current passes through them.
(a) What is the equivalent resistance?
(b) What is the potential difference across the three resistors?
2.)A 70.0-W lamp is placed in series with a resistor and a 120.0-V source. If the voltage across the lamp is 30 V, what is the resistance R of the resistor?
3.)The current in a 46- resistor is 0.11 A. This resistor is in series with a 28- resistor, and the series combination is connected across a battery. What is the battery voltage?
4.) A coffee-maker (11 ) and a toaster (21 ) are connected in parallel to the same 110-V outlet in a kitchen. How much total power is supplied to the two appliances when both are turned on?
5.) For a three-way bulb (35 W, 120 W, 155 W) that is designed to operate at 110 V, find the resistance of each of the two filaments. Assume that the wattage ratings are not limited by significant figures, and ignore any heating effects on the resistances
6.)
A 58.0- resistor is connected in parallel with a 124.0- resistor. This parallel group is connected in series with a 21.0- resistor. The total combination is connected across a 15.0-V battery.
(a) Find the current in the 124.0- resistor.
(b) Find the power dissipated in the 124.0- resistor.
7.) A battery has an internal resistance of 1.20 . A number of identical light bulbs, each with a resistance of 19.2 , are connected in parallel across the battery terminals. The terminal voltage of the battery is observed to be one-half the emf of the battery. How many bulbs are connected?
8.) When a light bulb is connected across the terminals of a battery, the battery delivers 24 W of power to the bulb. A voltage of 12.0 V exists between the terminals of the battery, which has an internal resistance of 0.19 . What is the emf of the battery?
9.) The coil of a galvanometer has a resistance of 21.2 , and its meter deflects full scale when a current of 5.64 mA passes through it. To make the galvanometer into an ammeter, a 26.1-m shunt resistor is added to it. What is the maximum current that this ammeter can read?
10.) The coil of wire in a galvanometer has a resistance of RC = 75.0 . The galvanometer exhibits a full-scale deflection when the current through it is 0.380 mA. A resistor is connected in series with this combination so as to produce a voltmeter. The voltmeter is to have a full-scale deflection when it measures a potential difference of 10.0 V. What is the resistance of this resistor?
Explanation / Answer
1)
(a) The equivalent resistance
R = R1 + R2 + R3 = 26 + 46 + 76= 148
(b) The PD across the three resistors is
V = iR = 0.55 * 148 = 81.4 V
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