MDCAT & ECAT Current Electricity MCQS

Current electricity refers to the flow of electric charge through a conductor, typically in the form of electrons moving through a wire. It is a fundamental concept in physics and is central to many practical applications in technology and everyday life.
Key points about current electricity include:
Electric Charge: Electric charge is a fundamental property of matter. Electrons carry a negative charge, while protons carry a positive charge. When there is a net movement of charge, an electric current is generated.
Electric Current: Electric current is the flow of electric charge. It is measured in amperes (A). One ampere of current is equivalent to the flow of one coulomb of charge per second.
Conductors and Insulators: Conductors are materials that allow the flow of electric charge with minimal resistance. Metals like copper and aluminum are good conductors. Insulators, on the other hand, inhibit the flow of electric charge. Examples include rubber, plastic, and glass.
Voltage: Voltage (also called electric potential difference) is the driving force that pushes electric charge through a circuit. It is measured in volts (V). Voltage is analogous to pressure in a water pipe; the higher the voltage, the more force there is to push electric charge through a circuit.
Resistance: Resistance is a property that opposes the flow of electric current. It is measured in ohms (Ω). Materials with high resistance impede the flow of current more than materials with low resistance. The relationship between voltage, current, and resistance is described by Ohm's Law: V = IR, where V is voltage, I is current, and R is resistance.
Circuits: Electric circuits are paths through which electric current can flow. They can be simple, consisting of just a few components, or complex, involving numerous interconnected devices. Circuits can be either series, where components are arranged sequentially, or parallel, where components are arranged in separate branches.
Power: Power is the rate at which electrical energy is transferred by an electric circuit. It is measured in watts (W). Power can be calculated using the formula P = VI, where P is power, V is voltage, and I is current.