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Interactive EX308 Formula Sheet
Click any formula to see calculator keys, meanings of variables and formula transpositions
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| Ohm's Law \( V = IR \) | Power \( P = V \times I \) |
| Series \( R_T = R_1 + R_2 + R_3 \) | Parallel \( \frac{1}{R_T} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} \) |
| Potential divider \( V_{out} = V_{in} \frac{R_2}{R_1 + R_2} \) | |
| Series \( \frac{1}{C_T} = \frac{1}{C_1} + \frac{1}{C_2} + \frac{1}{C_3} \) | Parallel \( C_T = C_1 + C_2 + C_3 \) |
| Series \( L_T = L_1 + L_2 + L_3 \) | Parallel \( \frac{1}{L_T} = \frac{1}{L_1} + \frac{1}{L_2} \) |
| AC \( V_{rms} = \frac{V_{peak}}{\sqrt{2}} \) | AC \( t = \frac{1}{f} \) \( f = \frac{1}{t} \) |
| Inductor \( X_L = 2{\pi}fL \) | Capacitor \( X_C = \frac{1}{2{\pi}fC} \) |
| Tuned curcuit \( Q = \frac{f_C}{f_U-f_L} = \frac{centre frequency}{bandwidth}\) | |
| Transformer \( V_s = V_p\frac{N_s}{N_p} \) | Transformer \( I_p = I_s\frac{N_s}{N_p} \) |
| Transistor \( I_c={\beta}I_B \) | |
| Velocity of radio waves in free space \( v = \) 3x108 m/s \( = \) 300,000,000 m/s |
Frequency & wavelength \( v=f{\lambda} \) |
| Antenna \( erp = power \times gain \,(linear) \) | |