What is the unit of resistance?

The unit of resistance is the ohm (Ω).

What factors affect resistance?

Length of conductor, cross-sectional area, and resistivity of the material.

Resistivity represents the ability of a material to oppose the motion of charge carriers.

Ohm's Law states that current is directly proportional to voltage and inversely proportional to resistance: I = V / R.

What is the formula for electrical power (P)?

P = W / t = qV / t = VI, where W is work, q is charge, V is voltage, and I is current.

What is the formula for work done (W) in transferring charge?

W = qV, where q is charge and V is voltage.

What is the electromotive force (EMF)?

EMF is the energy supplied to charge by a battery cell, measured in volts.

What is Kirchhoff's Voltage Law (KVL)?

KVL states that the algebraic sum of voltages in a closed loop is zero.

What is Kirchhoff's Current Law (KCL)?

KCL states that the algebraic sum of currents entering a node is zero.

What is the formula for magnetic force (F) on a current-carrying wire?

F = ILB sin θ, where I is current, L is length of the wire, B is magnetic field strength, and θ is the angle between the wire and the magnetic field.

What is the formula for magnetic flux (φ)?

φ = B · A cos θ, where B is magnetic field strength, A is area, and θ is the angle between the magnetic field and the normal to the surface.

What is Faraday's Law of Electromagnetic Induction?

Faraday's Law states that the induced EMF in a closed loop is equal to the negative rate of change of magnetic flux through the loop.

Lenz's Law states that an induced current will flow in a direction that opposes the change in magnetic flux that produced it.

What is the formula for the strength of the magnetic field (B) near a wire?

B = (μ₀I) / (2πr), where μ₀ is the permeability of free space, I is current, and r is the distance from the wire.

What is the relationship between electricity and magnetism?

Electricity and magnetism are interconnected; a changing electric field creates a magnetic field and vice versa.

What is the formula for the strength of the magnetic field produced by a moving charge?

B = (μ₀qv sin θ) / (4πr²), where q is charge, v is velocity, and r is distance from the wire.

A solenoid is a coil of wire that generates a controlled magnetic field when an electric current passes through it.

What is a transformer?

A transformer is a device that transfers electrical energy through electromagnetic induction, consisting of a primary and secondary coil.

What is the difference between a step-up and a step-down transformer?

A step-up transformer increases voltage, while a step-down transformer decreases voltage.

What is the significance of Gauss's Law?

Gauss's Law relates the electric field to the charge enclosed by a surface, stating that electric field lines originate on positive charges and terminate on negative charges.

What is the unit of magnetic field strength?

The unit of magnetic field strength is the Tesla (T).

What is the formula for calculating electrical energy (E)?

E = P · t, where P is power and t is time.

What is the formula for calculating the current (I) in a circuit?

I = ε - V / r, where ε is electromotive force, V is voltage, and r is internal resistance.

What is the purpose of an ammeter?

An ammeter is a device used to measure electric current.

What is the purpose of a voltmeter?

A voltmeter is a device used to measure potential difference (voltage) in an object.

What is the purpose of an ohmmeter?

An ohmmeter is a device used to measure resistance.

What is the purpose of a multimeter?

A multimeter is a device that can measure current, voltage, resistance, temperature, and other electrical properties.

What happens when you connect a 110V appliance to a 220V socket?

It will develop more heat and probably burn out in minutes.

What happens when you connect a 220V appliance to a 110V socket?

It will normally last longer before it fails or may not start.

What is the formula for calculating the potential drop (V) across a resistor?

V = IR, where I is current and R is resistance.

What is the formula for calculating the power lost in a resistor?

P = I²R, where I is current and R is resistance.

What is the formula for calculating the energy supplied to an electric motor?

E = P · t, where P is power and t is time.

What is the formula for calculating the current drawn by a light bulb?

I = P / V, where P is power and V is voltage.

What is the formula for calculating the work done in transferring charge?

W = qV, where q is charge and V is voltage.

What is the formula for calculating the average power required to transfer charge?

P = W / t, where W is work and t is time.

What is the formula for calculating the energy cost of operating an electric device?

Operating cost = E · cost per kWh, where E is energy in kWh.

What is the formula for calculating the resistance of a wire based on its resistivity?

R = ρL / A, where ρ is resistivity, L is length, and A is cross-sectional area.

What is the formula for calculating the length of a wire based on its resistance?

L = R · A / ρ, where R is resistance, A is cross-sectional area, and ρ is resistivity.

What is the formula for calculating the new resistance of a wire at a different temperature?

R = R₀ + αR₀(Tf - T₀), where R₀ is initial resistance, α is temperature coefficient, Tf is final temperature, and T₀ is initial temperature.

What is the formula for calculating the original resistance of a wire at a different temperature?

R₀ = R / (1 + α(Tf - T₀)), where R is new resistance, α is temperature coefficient, Tf is final temperature, and T₀ is initial temperature.

What is the formula for calculating the electromotive force (EMF) in a circuit?

ε = V + Ir, where V is voltage, I is current, and r is internal resistance.

What is the formula for calculating the current in a circuit with known EMF and internal resistance?

I = (ε - V) / r, where ε is EMF, V is voltage, and r is internal resistance.

General Physics 2 - Current, Resistance, and Voltage Flashcards

Student preview

100 questions

Show all answers

1.

FLASHCARD QUESTION

Front

What is the formula for current (I)?

Back

I = q / t, where I is current, q is charge, and t is time.

2.

FLASHCARD QUESTION

Front

What is the unit of current?

Back

The unit of current is the ampere (A), which is equivalent to coulomb per second (C/S).

3.

FLASHCARD QUESTION

Front

What is the difference between conventional current and electron flow?

Back

Conventional current assumes flow from positive to negative, while electron flow is from negative to positive.

4.

FLASHCARD QUESTION

Front

What is Direct Current (DC)?

Back

DC is a type of current that flows in one direction.

5.

FLASHCARD QUESTION

Front

What is Alternating Current (AC)?

Back

AC is a type of current that changes direction periodically.

6.

FLASHCARD QUESTION

Front

How do you calculate charge (Q) if you know current (I) and time (t)?

Back

Q = I · t.

7.

FLASHCARD QUESTION

Front

What is the formula for resistance (R)?

Back

R = V / I, where V is voltage and I is current.

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