Series and Parallel Circuits

What is electrical resistance?

• The energy stored in a circuit

• The energy dissipated in a circuit

• The energy created by a circuit

• The energy lost outside a circuit

What happens to the current when the potential difference is increased and resistance remains constant?

• The current decreases.

• The current remains the same.

• The current increases.

• The current fluctuates randomly.

What does a straight line I-V graph indicate about a resistor?

• The resistor is non-ohmic.

• The resistor has a constant resistance.

• The resistor's resistance varies with temperature.

• The resistor is broken.

What is the unit of resistance?

• Volt (V)

• Ampere (A)

• Ohm (Ω)

• Joule (J)

What is the relationship between potential difference and current in an ohmic resistor?

• The potential difference is inversely proportional to the current.

• The potential difference is directly proportional to the current.

• The potential difference is unrelated to the current.

• The potential difference is exponentially related to the current.

What is Ohm's Law commonly expressed as?

• V = IR or R = V/I

• V = I/R or R = VI

• V = R/I or R = I/V

• V = I + R or R = V - I

If a resistor has a constant value for V/I, what does it indicate about the resistance?

• The resistance is variable.

• The resistance is constant.

• The resistance is zero.

• The resistance is infinite.

How can the resistance be calculated from an I-V graph?

• By finding the area under the curve.

• By finding the gradient of the I-V graph and calculating the reciprocal.

• By finding the intercept on the voltage axis.

• By finding the intercept on the current axis.

What is the resistance when a current of 0.5 A is flowing and V/I is 3 Ω?

• 1.5 Ω

• 3 Ω

• 5 Ω

• 6 Ω

What is the formula for Ohm's Law?

• V = IR

• V = I/R

• V = R/I

• V = I + R