Current, Voltage, and Resistance

Front

What is current in an electrical circuit?

Back

Current is the flow of electric charge, typically carried by electrons in a conductor.

Front

What unit is used to measure current?

Back

The unit of current is the Ampere, often shortened to 'Amp' (A).

Front

What is voltage?

Back

Voltage, or electric potential difference, is the force that pushes electric charges through a circuit.

Front

What unit is used to measure voltage?

Back

The unit of voltage is the Volt (V).

Front

What is resistance in an electrical circuit?

Back

Resistance is a measure of how much a material opposes the flow of electric current.

Front

What unit is used to measure resistance?

Back

The unit of resistance is the Ohm (Ω).

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 = I × R.

Front

How many volts are needed to push 1 amp through a resistance of 1 ohm?

Back

1 volt.

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 current if resistance increases while voltage remains constant?

Back

If resistance increases while voltage remains constant, the current decreases.