Test 2: Ohm’s Law, Resistance, Sensors, Power and Household Safety

Question 1

According to Ohm's law, current through a conductor is directly proportional to the potential difference across its ends provided the:

• Aphysical state (dimension, temperature, etc.) of the conductor remains the same
• Bcolour of the wire is the same
• Cbattery is old
• Dlength of wire changes

Question 2

The relationship between voltage, current, and resistance is:

• AV = I R
• BV = I / R
• CV = I^2 R
• DV = R / I

Question 3

The SI unit of resistance is the ohm, where 1 ohm equals:

• A1 V A^-1
• B1 A V^-1
• C1 J C^-1
• D1 C s^-1

Question 4

Resistors are in series when there is:

• Aonly one path for current to flow
• Bmultiple paths for current
• Cno current
• Da gap in the circuit

Question 5

The equivalent resistance of three resistors connected in series is:

• AR1 + R2 + R3
• B1/R1 + 1/R2 + 1/R3
• CR1 x R2 x R3
• DR1 - R2 - R3