Electric generator, preferably dynamo, for an internal combustion engine, - having a radially outer stator, - having a radially inner rotor, - having a housing on which the rotor is arranged so as to be rotatable about a rotatable axis, on which the stator is arranged in a rotationally fixed fashion and which has a housing casing which runs around in the circumferential direction, a front side wall and a rear side wall, - having an axially outer impeller wheel which is arranged on an outer side, facing axially away from the rear side wall, of the front side wall and is arranged in a rotationally fixed fashion on the rotor, - having a primary air inlet which has a plurality of inlet openings formed in the rear side wall, - having an air outlet which has a plurality of outlet openings formed in the front side wall, - having a primary air path which leads inside the housing from the primary air inlet to the air outlet, - wherein during operation of the generator the impeller wheel rotates with the rotor and generates, on the outer side of the front side wall, in the region of the outlet openings, a partial vacuum which generates the primary airflow which enters the primary air inlet, follows the primary air path and exits through the air outlet, - wherein a secondary air inlet is provided which has a plurality of secondary inlet openings formed in the housing casing, - wherein a secondary air path is provided which leads within the housing from the secondary air inlet to the air outlet, - wherein during operation of the generator the partial vacuum generated by the rotating impeller wheel generates a secondary airflow which enters through the secondary air inlet, follows the secondary air path and exits through the air outlet, characterized in that the respective secondary inlet opening has a radially outer inlet end and a radially inner outlet end which is arranged axially offset with respect to the inlet end in the direction of the front side wall such that the secondary airflow cannot flow directly radially through said secondary inlet opening and direct radial through-flow of the housing casing is therefore not possible. - having a radially outer stator, - having a radially inner rotor, - having a housing on which the rotor is arranged so as to be rotatable about a rotatable axis, on which the stator is arranged in a rotationally fixed fashion and which has a housing casing which runs around in the circumferential direction, a front side wall and a rear side wall, - having an axially outer impeller wheel which is arranged on an outer side, facing axially away from the rear side wall, of the front side wall and is arranged in a rotationally fixed fashion on the rotor, - having a primary air inlet which has a plurality of inlet openings formed in the rear side wall, - having an air outlet which has a plurality of outlet openings formed in the front side wall, - having a primary air path which leads inside the housing from the primary air inlet to the air outlet, - wherein during operation of the generator the impeller wheel rotates with the rotor and generates, on the outer side of the front side wall, in the region of the outlet openings, a partial vacuum which generates the primary airflow which enters the primary air inlet, follows the primary air path and exits through the air outlet, - wherein a secondary air inlet is provided which has a plurality of secondary inlet openings formed in the housing casing, - wherein a secondary air path is provided which leads within the housing from the secondary air inlet to the air outlet, - wherein during operation of the generator the partial vacuum generated by the rotating impeller wheel generates a secondary airflow which enters through the secondary air inlet, follows the secondary air path and exits through the air outlet,