Unit-7 Electric Current and Circuits Review

Front

What is electric current?

Back

Electric current is the flow of electric charge, typically measured in amperes (A). It represents the movement of electrons through a conductor.

Front

Define resistance in an electrical circuit.

Back

Resistance is a measure of the opposition to the flow of electric current, measured in ohms (Ω). It determines how much current will flow for a given voltage.

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). It can be expressed as V = IR.

Front

What is the formula to calculate resistance?

Back

Resistance (R) can be calculated using the formula R = V/I, where V is voltage and I is 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 (R_total) can be calculated using the formula 1/R_total = 1/R₁ + 1/R₂ + 1/R₃ + ...

Front

What is the unit of electric current?

Back

The unit of electric current is the ampere (A).

Front

How do you calculate the current flowing through a resistor?

Back

The current (I) flowing through a resistor can be calculated using Ohm's Law: I = V/R, where V is the voltage across the resistor and R is the resistance.

Front

What is the effect of increasing resistance on current?

Back

Increasing resistance in a circuit decreases the current flow, assuming the voltage remains constant.

Front

What is a light bulb's resistance if it has a current of 3 A and a voltage of 9 V?

Back

Using Ohm's Law, R = V/I = 9V/3A = 3 ohms.