Chapter 7

Created by

THARANE THAVAKUMAR

Cards (38)

What does energy mean in the context of physics?
Energy means the ability to do work.
What is the S.I. unit for energy?
The S.I. unit for energy is joule (J).
What are the different forms of energy?
Sound energy
Kinetic energy
Electrical energy
Gravitational potential energy
Elastic potential energy
Light energy
Nuclear energy
Heat energy
Chemical energy
What are the sources of energy?
The Sun
Geothermal
Water
Biomass
Fossil fuel
Radioactive substances
Wave
Wind
What do electric charges consist of?
Electric charges consist of positive charges and negative charges.
What are the forces called that arise from the repulsion among electric charges?
The repulsion among electric charges is called electrostatic forces.
What instrument is used to detect the existence of electric charges on an object?
An electroscope is used to detect the existence of electric charges on an object.
How can electric current be defined?
Electric current can be defined as the rate of flow of electric charges through a conductor.
What is the S.I. unit for electric current?
The S.I. unit for electric current is ampere (A).
How is electric current measured?
Electric current is measured by an ammeter.
What is voltage defined as?
Voltage is the potential difference between two points.
What is the S.I. unit for voltage?
The S.I. unit for voltage is volt (V).
How is voltage measured?
Voltage is measured by a voltmeter.
What is the unit for measuring resistance?
The unit for measuring resistance is ohm (Ω).
What is Ohm's Law?
Ohm's Law states that:
Voltage (V) = Current (I) × Resistance (R)
What is the formula for Ohm's Law?
The formula for Ohm's Law is \(V = IR\).
What is a series circuit?
A series circuit is made up of electrical components connected one after another where the current flows through in a single path.
How does current behave in a series circuit?
In a series circuit, the current is the same through all components, represented as \(I = I¹ = I).
What is the formula for voltage in a series circuit?The voltage in a series circuit is the sum of the voltages across each component, represented as \(V = V¹ + V²).
The voltage in a series circuit is the sum of the voltages across each component, represented as \(V = V¹ + V²).
How is resistance calculated in a series circuit?
The total resistance in a series circuit is the sum of the individual resistances, represented as \(R = R_1 + R_2\).
What are the advantages and disadvantages of a series circuit?
Advantages:
Energy component in the circuit receives the same amount of current.
Every component is controlled by the same switch.
Increase in voltage supplies more electric current.

Disadvantages:
If one electrical appliance is damaged, others cease to function.
Adding more appliances increases resistance and decreases current flow.
Each appliance cannot be switched off individually.
What is a parallel circuit?
A parallel circuit is separated into several different paths of electrical circuit, with each path having electrical components.
How does current behave in a parallel circuit?
In a parallel circuit, the total current is the sum of the currents through each path, represented as \(I = I_1 + I_2\).
What is the formula for voltage in a parallel circuit?
The voltage across each component in a parallel circuit is the same as the source voltage, represented as \(V = V_1 = V_2\).
How is resistance calculated in a parallel circuit?
The total resistance in a parallel circuit is calculated using the formula \(\dfrac{1}{R} = \dfrac{1}{R_1} + \dfrac{1}{R_2}\).
What are the advantages and disadvantages of a parallel circuit?
Advantages:
Every electrical appliance can be switched on or off separately.
The increase in the number of appliances does not affect the function of others.

Disadvantages:
The voltage for every appliance cannot be adjusted because it is the same as the source voltage.
What is the definition of magnetism?
Magnetism is a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.
What are the properties of a magnet?
Attracts magnetic materials
Has poles (north pole and south pole)
Like poles repel, unlike poles attract
Freely suspended magnet shows north-south direction
What is a magnetic field?
The magnetic field is the area around the magnet where magnetic forces can be detected.
What are the characteristics of magnetic field lines?
Begin from the north pole to the south pole
Closer together where the magnetic field is stronger
Lines never meet or cross
What is an electromagnet?
An electromagnet is a type of magnet that has a temporary magnetic effect when electric current flows through it.
How does the pattern of a magnetic field depend on the conductor used?
The pattern of the magnetic field varies based on the type of conductor and its configuration.
How is the direction of the magnetic field determined?
The direction of the magnetic field is determined by the direction of the electric current flowing through the conductor.
What rule is used to determine the direction of the magnetic field?
The right hand grip rule is used to determine the direction of the magnetic field.
What are some applications of magnets and electromagnets in daily life?
The needle of a compass uses a magnet to show direction.
Credit and debit cards have an electromagnetic strip that stores information.
Magnetic locks on doors use electromagnets to lock automatically.
What does the needle of a compass use to show direction?
The needle of a compass uses a magnet to show the direction of the poles.
How do credit cards and debit cards utilize magnetism?
Credit cards and debit cards have an electromagnetic strip that stores information.
How do magnetic locks work?
Magnetic locks use an electromagnet to lock doors automatically.