Which of the following measures horsepower applied to the ground? Axle dynamometer Chassis dynamometer PTO dynamometer Ground dynamometer

## Step 1<br />The question is asking which of the given options measures the horsepower applied to the ground. Horsepower unit of power that measures the rate at which work is done or energy is transferred. In the context of vehicles, horsepower is often used to describe the power of an engine.<br /><br />## Step 2<br />An axle dynamometer measures the power output of the engine as it drives the wheels. This means it measures the power that the engine is producing, but it doesn't necessarily measure the power that is being applied to the ground.<br /><br />## Step 3<br />A chassis dynamometer measures the power output of the engine as it drives the entire vehicle, not just the wheels. This means it measures the power that the engine is producing, but it doesn't necessarily measure the power that is being applied to the ground.<br /><br />## Step 4<br />A PTO (Power Take-Off) dynamometer measures the power output of the engine as it drives an external load. This means it measures the power that the engine is producing, but it doesn't necessarily measure the power that is being applied to the ground.<br /><br />## Step 5<br />A ground dynamometer measures the power output of the engine as it drives the ground. This means it measures the power that the engine is producing and how much of that power is being applied to the ground.