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The primary coil of a transformer contains 24 turns of wire. The secondary coil of the transformer contains 1200 turns of wire.
The primary coil is connected to an alternating potential difference of 6.0 V. Calculate the potential difference across the secondary coil.
Our speakers use 200 mA of current at maximum volume. The voltage is 12V. The current is used to produce a magnet which is used to move the speaker cone. Find the resistance of the electromagnet.
What is the electric potential 15.0 cm from a point charge?
(a) Calculate the capacitance of a parallel-plate capacitor whose plates are 20 cm x 30 cm and are separated by a 1.0-mm air gap.
(b) what is the charge on each plate if a 12-V battery is connected across the two plates?
(c) What is the electric field between the plates?
A student walks 625m west and 475m north, calculate the distance of the student walk. Calculate the displacement of student walking west.
Calculate the displacement of student walking north
a block of 18kg is pushed along a horizontal frictionless surface by a horizontal force of 80N. the block start from rest. compute the kinetic energy after 6 seconds
. A rigid tank contains 10 𝑘𝑔 of water at 90𝑜 𝐶. If 8 𝑘𝑔 of the water is in the liquid form
and the rest is in vapour form, determine:
i. the pressure in the tank,
ii. the volume of the tank.
Physics Drill: Ohm’s Law. Solve the problem using the principles of Ohm’s
Law below. Show your complete solution.
1. Find the current through a resistor of resistance 𝑅 = 2Ω if the voltage across
the resistor is 6V.
2. While repairing an electric bulb socket, an electrician gets a mild shock when a
current of 0.0050 A passes through him. The same electrician was killed by a
current of 0.15 A when he turned on an electric bulb while taking a bath. The
voltage in each situation is equal to 120 V. Find the resistance of the electrician
in each situation.
3. A typical value of the resistance of a person from hand to hand through the
body is 2,000 Ω. If a person with this resistance accidentally touches a 220 V
live wire, what current passes through the person?
Physics Drill: Voltage Solve the problems about Voltage below. Show your
complete solutions.
1. It takes 20 J of work to push 4C of charge across the filament of a bulb. Find
the potential difference across the filament.2. The potential difference between two terminals of a cell is 3V. Find the Work
done in moving 5C of charge across the cell.
3. A group of electrons of net magnitude of charge, 𝑄 = 0.50 𝐶, passes through a
cell of voltage, 𝑉𝑐𝑒𝑙𝑙 = 20𝑉, from the (+) to the (-) terminal. What is the change
in energy, ∆𝐸, of the group of electrons as they move across the terminals?
Physics Drill: Electric Current. Fill in the missing information by solving for
the problem about electric current below:1. If the current in a wire is one ampere, then ___ coulomb(s) of charge flows past a
point in the wire every ____ second(s).
2. When 8 coulombs of charge flow past a point in a circuit in 2 seconds, the current
is ______.
3. If the current at appoint in a circuit is 1.5 A, then ____ of charge flow past this point
every second.
4. If the current at a point in a circuit is 0.75 A, then ___ of charge flow past this point
every 5 seconds.
5. If the current in the wire is 0.80 A, then it takes ___ seconds for 2.4 C of charge to
flow past this point in the wire
