Practice # 2 Current, Voltage, Resistance, Components

Front

What does electron flow theory state about the flow of electrons?

Back

Electrons flow from a negatively charged source to a positively charged source.

Front

What is the schematic symbol for a fixed resistor?

Back

The symbol typically consists of a zigzag line.

Front

What determines the amount of current that flows in a conductor under a given voltage?

Back

The resistance of the conductor.

Front

What type of energy does a photovoltaic cell convert into electricity?

Back

Light energy.

Front

What is the schematic symbol for a power source?

Back

The symbol usually resembles a circle with a plus and minus sign.

Front

Define current in the context of electrical circuits.

Back

Current is the flow of electric charge, measured in amperes (A).

Front

What is voltage and how is it measured?

Back

Voltage is the electric potential difference between two points, measured in volts (V).

Front

Explain 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). Formula: V = I * R.

Front

What is the function of a capacitor in a circuit?

Back

A capacitor stores electrical energy temporarily and releases it when needed.

Front

What is the difference between a potentiometer and a rheostat?

Back

A potentiometer is used to adjust voltage levels, while a rheostat is used to control current.