A current of 2 A flows for 6 s. Find charge transferred.
Answer and explanation
12 C
Q = It = 2 × 6 = 12 C.
Subjects
Electricity & circuits
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Sample exercises
A charge of 15 C passes in 5 s. Find current.
Answer and explanation
3 A
I = Q/t = 15/5 = 3 A.
In a steady series circuit, current after a resistor is generally what compared with current before it?
- The same
- Always half
- Always zero
Answer and explanation
The same
Charge is not accumulating at the resistor in the steady model.
What does a lamp primarily transfer from the electrical system?
- All of the circuit's charge permanently
- Energy
- The time coordinate
Answer and explanation
Energy
Energy transfers while the same rate of charge flow continues in steady state.
Why is current is used up in a resistor misleading?
Answer and explanation
A resistor transfers energy, but steady charge flow does not decrease along a series path.
Credit energy-versus-charge distinction.
A current of 0.5 A flows for 20 s. Find charge.
Answer and explanation
10 C
0.5 × 20 = 10 C.
Study notes
Charge, current and complete circuits
Describe a steady circuit without saying that current is consumed.
Grades 7–10Charge, current and complete circuits · Revision sheet
Describe a steady circuit without saying that current is consumed.
Grades 7–10Series and parallel: what stays the same
Use topology before choosing voltage and current rules.
Grades 9–12Series and parallel: what stays the same · Revision sheet
Use topology before choosing voltage and current rules.
Grades 9–12Electrical energy and power
Combine voltage, current, resistance and time without mixing units.
Grades 9–12Electrical energy and power · Revision sheet
Combine voltage, current, resistance and time without mixing units.
Grades 9–12Charge transferred by current
Current is a rate of charge transfer; use seconds, not minutes, here.
Grades 8–11Current in an ohmic resistor
Assume an ohmic resistor at constant temperature; circuit values are theoretical.
Grades 8–11Power in a series resistor network
Ideal source and wires; resistors are ohmic and connected in series.
Grades 10–12Total current in parallel branches
Each parallel branch has the same potential difference; branch currents add.
Grades 10–12Energy in kilowatt-hours
A kilowatt-hour is energy, not power.
Grades 8–11Electricity & circuits · Formula reference
Formula reference
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