4F - 7. Electric Circuits

What is the SI unit of electric current?

• Volt (V)

• Ohm (Ω)

• Ampere (A)

• Coulomb (C)

How many milliamperes are in 1 ampere?

• 100 mA

• 500 mA

• 2000 mA

• 1000 mA

What does an ammeter measure?

• Power

• Resistance

• Voltage

• Current

What is the conventional direction of current flow?

• From + to -

• From - to +

• From positive to neutral

• From negative to ground

What is the scientific name for voltage?

• Power

• Resistance

• Potential Difference

• Current

What happens to the potential difference across a cell when it is supplying current?

• It fluctuates

• It increases

• It decreases

• It remains the same

What is the unit of resistance?

• Coulomb (C)

• Ohm (Ω)

• Ampere (A)

• Volt (V)

Which material has more resistance?

• Aluminum

• Silver

• Copper

• Nichrome

What is the relationship between voltage, current, and resistance?

• V = I * R

• V = I + R

• V = R / I

• V = I / R

What type of resistor changes its resistance with temperature?

• Diode

• Light-dependent resistor

• Variable resistor

• Thermistor