Current, voltage and resistance
Grade 11 Science Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
A 12 V battery is joined across a 4 kΩ resistor. What current flows, in mA, Ari?
A 5 V battery is joined across a 2.5 kΩ resistor. What current flows, in mA, Bo?
A 9 V battery is joined across a 6 kΩ resistor. What current flows, in mA, Esme?
Luz reads the schematic. What does the voltmeter across the 80 Ω resistor read?
- 12 V, the battery voltage
- 4 V: 0.10 A × 40 Ω
- 8 V: 0.10 A × 80 Ω
- 6 V, the battery voltage shared equally
A 470 Ω resistor has 9.4 V across it. What current flows through it, Milo?
- 0.02 mA, out by a factor of 1,000
- 200 mA, out by a factor of ten the other way
- 20 mA: 9.4 V ÷ 470 Ω = 0.020 A
- 2 mA, out by a factor of ten
A 4.7 kΩ resistor carries 2.0 mA. What voltage is across it, Noah?
- 2.35 V: 4.7 kΩ ÷ 2.0 mA
- 9.4 V: 0.0020 A × 4,700 Ω
- 9,400 V: 2.0 A × 4,700 Ω
- 0.0094 V: 0.0020 A × 4.7 Ω
A 330 Ω resistor and a 3.3 kΩ resistor are each joined to the same battery. Which carries more current, and by how much, Pia?
- They carry equal currents, since the voltage is the same
- The 330 Ω resistor carries 10 times as much
- The 3.3 kΩ resistor carries 10 times as much
- The 330 Ω resistor carries 100 times as much
Why must a voltmeter have a very high resistance, Ren?
- It measures current, which needs a high resistance
- It needs to handle large voltages without overheating
- It must add resistance so it shares the circuit's current
- It draws a tiny current, so it barely changes the circuit
Tala connects an ammeter across a resistor instead of in the loop. What happens?
- The ammeter reads zero because no current enters it
- A large current bypasses the resistor through the ammeter
- The resistor carries twice the current
- Nothing changes; the meter reads the resistor's current
Zee reads the voltage-current graph of a resistor. What is its resistance?
- 0.05 Ω: 0.4 A ÷ 8 V
- 20 Ω: 8 V ÷ 0.4 A
- 8.4 Ω: 8 V + 0.4 A
- 3.2 Ω: 8 V × 0.4 A