Podcast
Questions and Answers
What is the charge on an electron?
What is the charge on an electron?
- +1.6 × 10–19
- 1 × 10–19
- -1.6 × 10–19 (correct)
What is the unit of charge in the SI system?
What is the unit of charge in the SI system?
- Farad
- Volt
- Ampere
- Coulomb (correct)
Which of the following represents Coulomb's law?
Which of the following represents Coulomb's law?
- $F = k \frac{q_1 q_2}{r^2}$ (correct)
- $F = k \frac{q_1 q_2}{r}$
- $F = k \frac{q_1 q_2}{r^3}$
- $F = k \frac{q_1 + q_2}{r}$
What is the value of the constant K in Coulomb's law?
What is the value of the constant K in Coulomb's law?
What is the relationship between the electrostatic unit (esu) and the electromagnetic unit (emu) of charge?
What is the relationship between the electrostatic unit (esu) and the electromagnetic unit (emu) of charge?
What is the formula for calculating the total inductance (LAB) of three inductors connected in series?
What is the formula for calculating the total inductance (LAB) of three inductors connected in series?
What is the value of F, in Farads?
What is the value of F, in Farads?
What is the relationship between inductance (L) and capacitance (C) in the given context?
What is the relationship between inductance (L) and capacitance (C) in the given context?
What is the correct formula for calculating the reciprocal of the inductance of an inductor in series with another inductor?
What is the correct formula for calculating the reciprocal of the inductance of an inductor in series with another inductor?
What is the unit of measurement for inductance?
What is the unit of measurement for inductance?
What is the power of an electric iron that has a voltage of 230V and a current of 10A?
What is the power of an electric iron that has a voltage of 230V and a current of 10A?
Which material is commonly used as a heating element in a toaster?
Which material is commonly used as a heating element in a toaster?
Which of the following is NOT an insulator?
Which of the following is NOT an insulator?
Which of the following is used to control the temperature of an electric iron?
Which of the following is used to control the temperature of an electric iron?
What is the EMF of a battery connected to a 20Ω resistor that produces a current of 0.75A?
What is the EMF of a battery connected to a 20Ω resistor that produces a current of 0.75A?
What is the relationship between the temperature of a heating element and its resistance?
What is the relationship between the temperature of a heating element and its resistance?
Which of the following is NOT a characteristic of a good heating element?
Which of the following is NOT a characteristic of a good heating element?
What is the main component of a bimetallic strip?
What is the main component of a bimetallic strip?
What is the unit of electric current in the SI system?
What is the unit of electric current in the SI system?
What is the unit of capacitance in the SI system?
What is the unit of capacitance in the SI system?
What is the unit of magnetic field strength in the SI system?
What is the unit of magnetic field strength in the SI system?
Which of the following is the symbol for electric current?
Which of the following is the symbol for electric current?
What is the SI unit of electromotive force?
What is the SI unit of electromotive force?
Which of the following is the symbol for potential difference or voltage?
Which of the following is the symbol for potential difference or voltage?
Which of the following is the symbol for resistance?
Which of the following is the symbol for resistance?
What value is displayed by the voltmeter in the given picture?
What value is displayed by the voltmeter in the given picture?
Which of the following units is equivalent to 1 kilowatt-hour?
Which of the following units is equivalent to 1 kilowatt-hour?
Which of the following is the symbol for capacitance?
Which of the following is the symbol for capacitance?
Calculate the current flowing through the circuit, in Amps, given a voltage of 100V and an impedance of 10 ohms.
Calculate the current flowing through the circuit, in Amps, given a voltage of 100V and an impedance of 10 ohms.
What is the correct formula for calculating power?
What is the correct formula for calculating power?
Which of the following represents the unit of electric current density?
Which of the following represents the unit of electric current density?
Identify the component used for heating in an electric kettle.
Identify the component used for heating in an electric kettle.
What is the value of 1 kilowatt-hour (kWh) in watt-seconds?
What is the value of 1 kilowatt-hour (kWh) in watt-seconds?
What is the unit of impedance, as used in the context of the 100V, 50Hz circuit mentioned?
What is the unit of impedance, as used in the context of the 100V, 50Hz circuit mentioned?
Which of the following is the formula for calculating the potential difference across a resistor?
Which of the following is the formula for calculating the potential difference across a resistor?
What is the unit of power?
What is the unit of power?
Which of the following is a common application of the voltage divider rule, as demonstrated in the circuit diagram?
Which of the following is a common application of the voltage divider rule, as demonstrated in the circuit diagram?
What is the correct formula for calculating resistance?
What is the correct formula for calculating resistance?
What is the correct formula for calculating the current flowing through a circuit?
What is the correct formula for calculating the current flowing through a circuit?
Flashcards
Charge (Q)
Charge (Q)
A property of matter that causes it to experience a force in an electromagnetic field.
Coulomb's Law
Coulomb's Law
A law stating that the force between two charges is proportional to the product of their charges and inversely proportional to the square of the distance between them.
Coulomb (C)
Coulomb (C)
The SI unit of electric charge, defined as the amount of charge transported by a constant current of one ampere in one second.
Free Electrons
Free Electrons
Signup and view all the flashcards
K (Coulomb's constant)
K (Coulomb's constant)
Signup and view all the flashcards
Capacitance (F)
Capacitance (F)
Signup and view all the flashcards
1 Farad (F)
1 Farad (F)
Signup and view all the flashcards
Capacitance formula
Capacitance formula
Signup and view all the flashcards
C/V relationship
C/V relationship
Signup and view all the flashcards
Total capacitance (LAB)
Total capacitance (LAB)
Signup and view all the flashcards
Electric Power (P)
Electric Power (P)
Signup and view all the flashcards
Insulator
Insulator
Signup and view all the flashcards
Heating Element in Toaster
Heating Element in Toaster
Signup and view all the flashcards
Bimetallic Strip
Bimetallic Strip
Signup and view all the flashcards
Thermistor
Thermistor
Signup and view all the flashcards
Resistance (R)
Resistance (R)
Signup and view all the flashcards
Ohm's Law
Ohm's Law
Signup and view all the flashcards
EMF (Electromotive Force)
EMF (Electromotive Force)
Signup and view all the flashcards
Safe Operation Temperature
Safe Operation Temperature
Signup and view all the flashcards
Electromotive Force (e.m.f.)
Electromotive Force (e.m.f.)
Signup and view all the flashcards
SI Unit of Electromotive Force
SI Unit of Electromotive Force
Signup and view all the flashcards
Impedance (Z)
Impedance (Z)
Signup and view all the flashcards
Current (I)
Current (I)
Signup and view all the flashcards
Electrical Heating Unit
Electrical Heating Unit
Signup and view all the flashcards
Frequency (Hz)
Frequency (Hz)
Signup and view all the flashcards
Voltage (V) in Circuits
Voltage (V) in Circuits
Signup and view all the flashcards
BIS
BIS
Signup and view all the flashcards
Class of Fire D
Class of Fire D
Signup and view all the flashcards
Capacitance
Capacitance
Signup and view all the flashcards
Dielectrics
Dielectrics
Signup and view all the flashcards
Ampere per square meter (A/m²)
Ampere per square meter (A/m²)
Signup and view all the flashcards
Phase
Phase
Signup and view all the flashcards
Current Density
Current Density
Signup and view all the flashcards
S.I. Unit
S.I. Unit
Signup and view all the flashcards
KWH Definition
KWH Definition
Signup and view all the flashcards
1 KWH in Joules
1 KWH in Joules
Signup and view all the flashcards
Watt-hour
Watt-hour
Signup and view all the flashcards
Energy in Joules
Energy in Joules
Signup and view all the flashcards
AC vs DC
AC vs DC
Signup and view all the flashcards
Energy Conversion
Energy Conversion
Signup and view all the flashcards
Power Equation
Power Equation
Signup and view all the flashcards
Thermal Energy Example
Thermal Energy Example
Signup and view all the flashcards
Study Notes
Basic of Electricity
- Atoms are the smallest unit of a substance that participates in chemical reactions.
- Atoms consist of protons, neutrons, and electrons.
- Protons have a positive charge (+1.6 × 10⁻¹⁹ Coulombs).
- Electrons have a negative charge (-1.6 × 10⁻¹⁹ Coulombs).
- Neutrons have no charge.
- Free electrons are electrons in the outermost shell of most metals. These are more loosely bound to the nucleus than other electrons.
- Free electrons enable charge to move through the conductor.
- Current, in metals, flows due to free electrons whereas in ionic solutions like electrolytes, it flows through the ions.
Charge
- Charge is a property of matter which causes a substance to experience electrostatic attraction or repulsion.
- The S.I. unit of charge is the Coulomb (C).
- Charge can be positive or negative.
Coulomb's Law
- The electrostatic force between two charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
- F=k (q₁ q₂)/r²
- k is Coulomb's constant (approximately 9 × 10⁹ N⋅m²/C²).
- q₁ and q₂ are the magnitudes of the charges in Coulombs.
- r is the distance between the charges in meters.
Charge Density
- Linear charge density (λ): charge per unit length (C/m)
- Surface charge density (σ): charge per unit area (C/m²)
- Volume charge density (ρ): charge per unit volume (C/m³)
Electric Field
- An electric field is the region around a charge where another charge experiences a force.
- E = F/q
- The S.I. unit of electric field intensity is N/C (Newton per Coulomb).
Electric Potential
- Electric potential is the work done per unit charge in bringing a unit positive charge from infinity to a point in the electric field.
- V = W/q
- The S.I. unit of electric potential is Joules per Coulomb (or Volt).
Electric Current
- Electric current is the rate of flow of charge.
- I = Q/t, where I is current, Q is charge, and t is time.
- The S.I. unit of current is the Ampere (C/s).
Resistance
- Resistance is a measure of how difficult it is for current to flow through a material.
- R = V/I
- The S.I. unit of resistance is the Ohm (Ω).
Ohm's Law
- In a conductor, the current that flows is directly proportional to the voltage and inversely proportional to the value of resistance.
- I =V/R
- The law is applicable to a resistor (conductor with a consistently proportional current-voltage relationship).
Effects of Electric Current
- Heating effect: The conversion of electrical energy into heat when current flows through a conductor. This is Joule's effect( H = I²Rt )
- Magnetic effect: The creation of a magnetic field around a current-carrying conductor. This is used in motors and generators.
- Chemical effect: The decomposition of certain chemical compounds when an electric current passes through them (Electrolysis). This is used in electroplating.
Combinations of Resistances
-
Series: Resistances are connected end-to-end, resulting in an increased total resistance (Req=R1+R2+R3+...)
-
Parallel: Resistances are connected across each other, resulting in a decreased total resistance (1/Req = 1/R1 + 1/R2 + 1/R3+...)
Combinations of Capacitors
-
Series: Capacitors are connected end-to-end, resulting in a decreased total capacitance (1/Ceq = 1/C1 + 1/C2 + 1/C3 +...)
-
Parallel: Capacitors are connected across each other, resulting in an increased total capacitance (Ceq = C1+C2+C3+...).
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.