Setting a higher temperature on an electric oven will not make it heat up faster to the desired temperature that is set on the dial. Electric ovens have a built-in thermostat that regulates the temperature inside the oven chamber. When you set a specific temperature on the dial, the oven's heating elements will be powered to work until the internal thermostat senses that the oven has reached the desired temperature.
The rate at which the oven heats up to the set temperature is determined by the oven's design, insulation, and the power of its heating elements. It will generally take a consistent amount of time to reach the temperature, regardless of whether you set a higher or lower temperature on the dial.
However, once the oven reaches the desired temperature, setting it to a higher temperature on the dial will make the heating elements work continuously at a higher level to maintain that higher temperature. This can lead to the food cooking faster or potentially overcooking if you don't adjust the cooking time accordingly.
For example, if you set the oven to 180°C (350°F) or 200°C (390°F), the time it takes to reach that temperature will be about the same, but at 200°C, the oven will work harder to maintain that higher temperature once it reaches it. So, it's essential to follow the recommended baking or cooking time for your recipe and not solely rely on adjusting the oven dial to speed up the heating process.