Electricity and Magnetism

Front

What is Ohm's Law?

Back

Ohm's Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. It can be expressed as V = I × R.

Front

What is the unit of resistance?

Back

The unit of resistance is Ohm (Ω).

Front

What is a conductor?

Back

A conductor is a material that allows electrons to move easily through it, facilitating the flow of electric current.

Front

What is an insulator?

Back

An insulator is a material that does not allow electrons to move freely, thus preventing the flow of electric current.

Front

What happens to the total resistance in a series circuit?

Back

In a series circuit, the total resistance is the sum of the individual resistances: R_total = R1 + R2 + R3 + ...

Front

What happens to the total resistance in a parallel circuit?

Back

In a parallel circuit, the total resistance can be calculated using the formula: 1/R_total = 1/R1 + 1/R2 + 1/R3 + ...

Front

What is the formula for calculating voltage?

Back

Voltage (V) can be calculated using the formula: V = I × R, where I is the current in amperes and R is the resistance in ohms.

Front

What is the magnetic field around a solenoid?

Back

The magnetic field around a solenoid is the region where magnetic forces can be detected, and it is strengthened by increasing the number of coils or adding an iron core.

Front

What is the effect of adding more coils to a solenoid?

Back

Adding more coils to a solenoid increases the strength of the magnetic field.

Front

What is a parallel circuit?

Back

A parallel circuit is a type of electrical circuit where the components are connected across common points or junctions, allowing multiple paths for current to flow.