Question 1: Electric current is the rate of flow of electric charge through a conductor. It is measured in amperes (A).

Answer: Electric current measures how much charge flows through a point in a circuit per second, in amperes.

Question 1: Define electric current in your own words.

Answer: Electric current is the flow of electric charge per unit time through a conductor.

Question 2: Explain how electrons contribute to electric current in metallic conductors.

Answer: Electrons are negatively charged particles that move through the metal when a potential difference is applied. Their movement constitutes the electric current, with electrons flowing from the negative to the positive terminal.

Question 1: A circuit has a resistance of 10 ohms and a voltage of 20 volts. Calculate the current flowing through the circuit using Ohm's Law.

Answer: 2 A

Question 2: A device operates at 12 volts and draws a current of 3 amperes. What is its resistance?

Answer: 4 Ω

Question 1: Describe a simple experiment to measure the current in a circuit using an ammeter. Include safety precautions.

Answer: Connect the ammeter in series with the component whose current you wish to measure, ensuring correct polarity. Use insulated wires and avoid touching live circuits to prevent electric shocks.

Question 2: Identify the independent and dependent variables in an experiment measuring how current varies with resistance.

Answer: Independent variable: Resistance; Dependent variable: Current.

Question 1: A wire with a resistance of 5 Ω carries a current of 2 A. If the resistance increases to 10 Ω, what will be the new current? Explain your reasoning.

Answer: 1 A

Question 1: A circuit has a voltage of 24 V and a resistance of 12 Ω. Calculate the current flowing through the circuit and explain the steps involved.

Answer: Using Ohm's Law, I = V / R = 24 V / 12 Ω = 2 A. This calculation involves dividing the voltage by resistance to find current.

Question 1: Explain how current regulation is vital in electronic devices such as smartphones and computers.

Answer: Current regulation prevents damage to sensitive components, ensures proper functioning, and prolongs device lifespan through components like resistors, voltage regulators, and current limiters.