Chemistry and Electricity Basics

Covalent bonds are formed when non-metals share electrons with other non-metals.

The SI unit of potential difference (voltage) is the Volt.

Current electricity refers to the flow of electric charge, meaning the charge must be in motion.

A cation is a positively charged ion, formed by the loss of electrons.

A voltmeter is designed to measure potential difference across a component, so it must have very high resistance to prevent drawing current from the circuit.

Sodium is an alkali metal, not a noble gas. Noble gases are found in Group 18 of the periodic table, while sodium is in Group 1.

A voltmeter is specifically designed to measure the potential difference between two points in an electrical circuit. Ammeters measure current, while galvanometers detect small currents.

Neon, Argon, and Krypton are all noble gases, and they all possess a stable octet (eight electrons) in their outermost shell. Therefore, all of the listed options are correct.

The SI unit of electric current is the Ampere (A). Volt is the unit for potential difference, and Coulomb is the unit for electric charge.

Hydrogen can lose its single electron to form H+, which is a cation derived from a non-metal. Sodium (Na) and copper (Cu) are metals, making H+ the correct answer.

A voltmeter must be connected in parallel to the two points across which the potential difference is to be measured. This ensures it does not significantly alter the circuit current.

An ideal ammeter has zero resistance to avoid affecting the current in the circuit. In practice, an ammeter is designed to have very low resistance.

An anion is a negatively charged ion. It is formed when a neutral atom gains one or more electrons, resulting in more electrons than protons.

Atoms with 5, 6, or 7 valence electrons tend to gain electrons to complete their octet (reach 8 electrons) and achieve a stable noble gas configuration.

Covalent bonds are formed by the sharing of electron pairs between atoms. Ionic bonds, by contrast, involve the transfer of electrons.

When components are connected end to end in a single path, they are in series. This means the same current flows through each component.

To measure the current flowing through a conductor, an ammeter must be placed in series with the conductor so that the total current passes through the meter.

Heating appliances use Nichrome (an alloy of nickel and chromium) because it has high electrical resistance and does not oxidize easily at high temperatures.

When multiple resistances are connected between the same two points, they are in parallel. This configuration provides multiple paths for the current.

Ionic bonds typically form between metals (which lose electrons) and non-metals (which gain electrons) due to the electrostatic attraction between the resulting ions.

Parallel wiring is preferred for domestic appliances because it allows each device to operate independently at the same voltage and prevents the failure of one device from breaking the circuit for others.

Sodium chloride (NaCl) is formed by the transfer of an electron from sodium to chlorine, resulting in Na+ and Cl- ions held together by ionic bonds.

When atoms of the same element bond, they share electrons equally because they have the same electronegativity, resulting in a covalent bond.

In Lewis structures, a single line between two atoms represents a single covalent bond, which consists of one shared pair of electrons.

The electric energy used in houses, factories, etc. is measured in kilowatt hour.