Understanding Electric Current and Power

What is electric current and how is it defined?

• Electric current is the static charge stored in a capacitor.

• Electric current is the resistance to electric flow, measured in ohms.

• Electric current is the speed of light in a vacuum.

• Electric current is the flow of electric charge, measured in amperes.

What is the primary function of a battery in a circuit?

• The primary function of a battery in a circuit is to supply electrical energy.

• To regulate the flow of current in a circuit.

• To convert electrical energy into mechanical energy.

• To store electrical energy for later use.

State Ohm's Law and explain its components.

• Ohm's Law is only applicable to superconductors and not to regular conductors.

• Ohm's Law states that the current (I) flowing 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 is mathematically expressed as V = I * R.

• Ohm's Law can be expressed as I = V + R.

• Ohm's Law states that voltage is independent of current and resistance.

How do you calculate electric power using voltage and current?

• P = V × I

• P = I - V

• P = V + I

• P = V / I

What is the formula for calculating energy consumption in a circuit?

• E = I² × R × t

• E = V + I + t

• E = V / I × t

• E = V × I × t

If a circuit has a current of 2 A and a resistance of 5 ohms, what is the voltage?

• 15 V

• 5 V

• 10 V

• 2 V

How does increasing resistance affect the current in a circuit according to Ohm's Law?

• Increasing resistance decreases the current in a circuit.

• Increasing resistance causes the current to fluctuate unpredictably.

• Increasing resistance has no effect on the current in a circuit.

• Increasing resistance increases the current in a circuit.

If a device uses 100 watts of power for 3 hours, how much energy does it consume in kilowatt-hours?

• 0.5 kWh

• 1 kWh

• 0.1 kWh

• 0.3 kWh