Question

1- What is the current in amperes if 1300 Na+Na+ ions flow across a cell membrane in 3.2 μsμs ? The charge on the sodium is the same as on an electron, but positive.

Express your answer to two significant figures and include the appropriate units.

2- What voltage will produce 0.45 AA of current through a 4800-ΩΩ resistor?

Express your answer to two significant figures and include the appropriate units.

3- An electric device draws 4.60 AA at 240 VV.If the voltage drops by 35 %% , what will be the current, assuming nothing else changes?

Express your answer to two significant figures and include the appropriate units.

b- If the resistance of the device were reduced by 35 %% , what current would be drawn at 240 VV?

Express your answer to two significant figures and include the appropriate units.

Answer #1

Consider an LR circuit when a 50.0-Hz 240-V
rms ac voltage is applied, where R = 2.30 kΩ , and
L = 410 mH .
What is the rms current the circuit?
Express your answer to three significant figures and include the
appropriate units.
What is the phase angle between voltage and current?
Express your answer using three significant figures.
How much power is dissipated?
Express your answer to three significant figures and include the
appropriate units.
What are the...

A 14.0-m length of wire consists of 9.0 m of copper followed by
5.0 m of aluminum, both of diameter 1.3 mm . A voltage difference
of 95 mVis placed across the composite wire. The resistivity of
copper is 1.68×10−8Ω⋅m and the resistivity of aluminum is
2.65×10−8Ω⋅m.
1. What is the total resistance (sum) of the two wires?
Express your answer to two significant figures and include the
appropriate units.
2. What is the current through the wire?
Express your...

The graph in (Figure 1) shows the current through a 2.0 ΩΩ
resistor as a function of time.
Figure
1 of 1The plot shows the current as a function of time. Time is
measured from 0 to 10 seconds on the x axis. Current is measured
from 0 to 2.5 amperes on the y axis. First the current stays at 0
amperes from the origin until 2 seconds. Then it jumps to 2.5
amperes and remains at this value until...

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 generator rotates at 83 Hz in a magnetic field of 0.045 T . It
has 550 turns and produces an rms voltage of 160 V and an rms
current of 65.0 A
What is the peak current produced?
Express your answer to three significant figures and include the
appropriate units
What is the area of each turn of the coil?
Express your answer to two significant figures and include the
appropriate units.

Please Answer all 3 completely! Thank you <3
1. In an integrated circuit, the current density in a
2.4-μm-thick × 72-μm-wide gold film is 7.0×105 A/m^2
Part A: How much charge flows through the film in 15 min?
Express your answer to two significant figures and include the
appropriate units.
2. The current in an electric hair dryer is 10 A . How many
electrons flow through the hair dryer in 5.8 min ? Express your
answer using two significant...

A generator produces 240kW of electric power at7.2 kV . The
current is transmitted to a remote village through wires with a
total resistance of15 ohms ? .
Part A
What is the power loss due to resistance in the wires?
Express your answer with the appropriate units.
P=
Part B
What is the power loss if the voltage is increased to 30 kV
?
Express your answer to two significant figures and include the
appropriate units.
P=

Suppose a 20-kW radio station emits EM waves uniformly in all
directions.
Part A
How much energy per second crosses a 1.4 m2 area 1 km from the
transmitting antenna?
Express your answer to two significant figures and include the
appropriate units.
Part B
What is the rms magnitude of the
E⃗ field at this point, assuming
the station is operating at full power?
Express your answer to two significant figures and include the
appropriate units.
Part C
What is...

It takes 2.25 ms for the current in an LR circuit to increase
from zero to 0.66 its maximum value.
Part A
Determine the time constant of the circuit.
Express your answer to two significant figures and include the
appropriate units.
Part B
Determine the resistance of the circuit if 35.0 mH .
Express your answer to two significant figures and include the
appropriate units.

Part A What mass of Cu(s) is electroplated by running 18.0 A of
current through a Cu2+(aq) solution for 4.00 h? Express your answer
to three significant figures and include the appropriate units.
Part B How many minutes will it take to electroplate 37.1 g of
gold by running 5.00 A of current through a solution of Au+(aq)?
Express your answer to three significant figures and include the
appropriate units.

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