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Update Unit_4_Physics_Study_Sheet.md

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Grade 9/Science/SNC1DZ/Unit_4_Physics_Study_Sheet.md
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- The electric currnet is measured by an `ammeter`. - The electric currnet is measured by an `ammeter`.
- It is connected `in series` to the item you wnat to measure, which means you put the ammeter `infront or behind` the item you want to measure. - It is connected `in series` to the item you wnat to measure, which means you put the ammeter `infront or behind` the item you want to measure.
### 3. Potential Difference / Voltageg ### 3. Potential Difference / Voltage
- the `difference` in electrical potential `energy` when a charge moved between `2 points` in an electric circuit. - the `difference` in electrical potential `energy` when a charge moved between `2 points` in an electric circuit.
- **Symbol** for **Voltage**: `V`. - **Symbol** for **Voltage**: `V`.
- **Unit** for **Voltage**: `Volt[V]` - **Unit** for **Voltage**: `Volt[V]`
@ -288,5 +288,21 @@
- `Everything` has resistance. Conductor has low resistnace. Insulator has high resistance. - `Everything` has resistance. Conductor has low resistnace. Insulator has high resistance.
- Example: wire has an resistnace so low that it is ignored in many calculations. - Example: wire has an resistnace so low that it is ignored in many calculations.
## Product Efficiencies
- Simply take the output / input x 100 and you get the percentage of the efficiency of your product.
## Ohm's Law
- Ohm's law states that $`V = IR`$, which means the volatage is equal to the current multiplied by the resistance.
- When given a circuit, with one unknown value such as `I`, simply use Ohm's law to find the missing value.
## Series Circuits
- In a series circuit, there are a set of rules where the current, voltage, and resistance follow.
- $`I_T = I_1 = I_2 = I_3 \cdots = I_N`$
- $`V_T = V_1 + V_2 + V_3 \cdots + V_N`$
- $`R_T = R_1 + R_2 + R_3 \cdots + R_N`$
## Parallel Circuits
- In a parallel circuit, there are also a set of rules where the current, voltage, and resistance follow. The current and voltage rules are swapped in this case.
- $`I_T = I_1 + I_2 + I_3 \cdots + I_N`$
- $`V_T = V_1 = V_2 = V_3 \cdots = V_N`$
- $`R_T = (R_1 + R_2 + R_3 \cdots + R_N)^{-1}`$ (I think).