Question

A 1.50 V battery supplies 0.250 W of power to a small flashlight for 30.0 min.

(a) How much charge (in C) does it move?____ C

(b) How many electrons must move to carry this charge?

Answer #1

. A 9V battery supplies power to a 2W lightbulb in a flashlight
and lasts for 50 hours. (a) How much current runs through the
simple flashlight circuit? (b) How many electrons pass through the
lightbulb in the time it stays lit? (c) What rating would this
battery be rated in A·h? (d) If the battery cost $2.00, how much
does the energy cost per kW·h?

When a certain 1.5-V batter is used to power a 3-W flashlight
bulb, it is dead after 71 minutes of use. If the battery costs
$0.53, what is the cost of a kilowatt-hour of electric energy
obtained in this way? Round to two decimal places, and do not
include the dollar sign!

A 14.0 V battery-operated bottle warmer heats 45.0 g of glass,
2.30 ? 102 g of baby formula, and 1.50 ? 102
g of aluminum from 25.0°C to 95.0°C. (Hint: Assume that the
specific heat of baby formula is about the same as the specific
heat of water.)
a)How much charge (in C) is moved by the battery?
_________________C
b)How many electrons per second flow if it takes 6.00 min to
warm the formula?
___________________electron(s)

1. How much does it cost to operate a 120-W lightbulb for 25 min
if the cost of electricity is $0.086 per kilowatt-hour?
2. A 75-V battery supplies 3.9 kW of power. How much current
does the battery produce? Express your answer to two significant
figures and include the appropriate units.
3. A battery connected to a 140-? resistor dissipates 2.5 W of
power. If the circuit contains only the battery and the resistor,
what is the voltage of the...

A small dry-cell battery of zinc, ammonium chloride, and MnO2
weighing 85 g will operate continuously through a 4-ohm resistance
for 450 min before its voltage falls below 0.75V. The initial
voltage is 1.60, and the effective voltage over the whole life of
the battery is taken to be 1.00V. How much work is obtained from
the battery, in Joules? How many moles of Zn are converted to ZnCl2
in this process, and what is the weight of this amount...

A heater dissipates 1900 W of power when it is
connected to a 100 V battery.
Part A
What current will flow through the heater when it is connected
to the battery?
Part B
What is R, the resistance of the heater?
Part C
How long does it take to raise the temperature of the air in a
good-sized living room that is 6.00 m × 6.00 m × 10.0
m by 10.0∘C? Note that the specific heat of air is 1006...

16.3 Capacitance
57. MC
A capacitor is first connected to a 6.0-V battery and then
disconnected and connected to a 12.0-V battery. How does its
capacitance change: (a) It increases, (b) it decreases, or (c) it
stays the same?
58. MC
A capacitor is first connected to a 6.0-V battery and then
disconnected and connected to a 12.0-V battery. How does the charge
on one of its plates change: (a) It increases, (b) it decreases, or
(c) it stays the same?
59. MC...

5) A car battery charger supplies 10A at 14V to recharge a 12V
car battery. The charger runs off the 120VAC power line. Assume
there is no loss in the charger itself.
A) How much power does the charger draw from the AC line?
B) How much current does the charger draw from the AC line?
C) If the battery stores 80% of the electrical energy coming
into it, how much energy does the battery gain if the charger is...

Two identical resistors are connected in parallel across a 27-V
battery, which supplies them with a total power of 6.9 W. While the
battery is still connected, one of the resistors is heated so that
its resistance doubles. The resistance of the other resistor
remains unchanged. Find (a) the initial resistance of each
resistor, and (b) the total power delivered to the resistors after
one resistor has been heated.

A capacitor (4.30 μF ) is connected in a parallel
arrangement with a second capacitor (1.50 μF ) and in
series with a 12-V battery
A)The battery is then removed,
leaving the two capacitors isolated.
If the smaller capacitor's capacitance is now doubled, by how
much does the charge on the larger capacitor change?
Express your answer using two significant figures.
B)By how much does the charge on the smaller capacitor
change?
Express your answer using two significant figures.
C)By...

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