Electrical current
- Current is the rate of flow of charge.
- The symbol for current is I.
- The unit of current is the ampere (A).
- 1 ampere is equal to 1 coulomb of charge passing through a point in 1 second.
- The current can be measured using an ammeter.
Current equation - charge and time
\text{current} = \frac{\text{change in charge}}{\text{change in time}}
I=\frac{\Delta Q}{\Delta t}
Current equation - voltage and resistance
\text{current} = \frac{\text{voltage}}{\text{resistance}}
I=\frac{V}{R}
| Question | Answer |
|---|
| What is the definition of current? | Current is the rate of flow of charge. |
| What is the symbol for current? | I |
| What is the unit of current? | The ampere (A). |
| What is the definition of one ampere? | 1 ampere is equal to 1 coulomb of charge passing through a point in 1 second. |
| Which instrument is used to measure current? | An ammeter. |
| Write the equation relating current, charge, and time. | I = \frac{\Delta Q}{\Delta t} |
| Write the equation relating current, voltage, and resistance. | I = \frac{V}{R} |